First aid medical care for minor injuries such as mild abrasions, cuts, bruises, and burns 急救 轻度擦伤、切伤、挫伤和烧伤等轻伤的医疗护理
First among equals the sentiment that a leader is merely the premier person among his or her colleagues 平等中的首席 领导只是其同僚中首要人物的观点
First base the first step or stage in a process or procedure, from baseball terminology 一垒 源自棒球术语，过程或程序的第一步或第一阶段
First blood referring to the rite of passage of a hunter making a first kill 首次流血 指代猎人第一次打猎之旅的习俗
(At) first blush referring to reconsideration of one's initial thought 乍一看 指代对最初想法的重新考虑
First call the right to priority in use of something 优先呼叫 优先使用某物的权利
First cause the philosophical concept of the original self-created cause of which all other causes are by-products 第一因 所有其他原因是原始自创原因副产品的哲学概念
First chair the lead musician among those playing a particular instrument in an orchestra (such as first violin) 第一把交椅 乐队中一种特定乐器的演奏者中的带头音乐家（比如第一小提琴手）
First class the best category of travel accommodations, or the best in terms of performance or quality 一等，一流 最好类别的旅行舱位，或性能或质量最佳
First come, first served the principle that the customer who arrives first is given priority 先到先招待 先到的顾客获得优先权的原则
First cousin a son or daughter of one's aunt or uncle 堂兄弟/姐妹，表兄弟/姐妹 某人阿姨/姑妈/姨妈或叔叔/姑父/舅父的儿子或女儿
First crack the earliest chance or opportunity 第一次尝试 最早的机遇或机会
First dance the tradition of the guests of honor being the first couple on the dance floor to start a ball or other dance event 第一支舞 舞会或其他跳舞活动开始，第一对在舞池中跳舞的客人，是一项荣誉
First dibs see "first call" 有优先权 同“first call”
First down the first in a series of plays in American football after one team takes possession of the ball from the other team 第一次进攻 美式足球中，一队从另一队中夺取球后一系列动作中的首次进攻
First edition the initial publication of a book 第一版 书籍的首次出版
First estate the clergy as the highest of the three orders of society in the Middle Ages and for some time afterward (the others were the nobility and the common people) 第一等级 中世纪及一段时间之后，社会三个等级中等级最高的牧师，（其他等级是贵族和平民）
First floor the ground floor (in American English usage) or the second floor (in British English usage) 第一层 首层（用于美式英语）或第二层（用于英式英语）
First flush (of success) an initial period of achievement (the term is also used technically to refer to the initial runoff of rainwater after a storm) 初尝（成功） 成就的初期（该术语还用于技术上，指代暴风雨后第一场雨水）
First glance a superficial examination or review 第一瞥 表面检查或审查
(At) first hand with direct experience (as an adjective, firsthand) 第一手地 来自直接经验（形容词为firsthand）
First impression the initial evaluation of information or an experience, generally before having time to consider or ponder 第一印象 信息或经历的初步评价，通常在有时间考虑或思索之前
First lady the wife of a government's leader 第一夫人 政府领导的妻子
First leg the first part of a journey 第一回合 旅程的第一部分
First light the earliest part of day 黎明，破晓 一天的最早时段
First night the evening of a premiere performance, or the premiere performance itself 首夜演出 首演的夜间，或夜间首演本身
(In the) first place in the beginning, or as an initial consideration 首先 起初，或作为初步考虑
(Right of) first refusal the privilege of being able to accept or reject an offer or proposal before anyone else is given consideration 优先购买（权） 在其他人有权考虑之前，能够接受或拒绝提议或建议的优先权
(Love at) first sight the sentiment of an instant romantic connection 初见（钟情） 瞬间陷入浪漫关系的情感
(The) first step (is always the hardest) the notion that starting a task is the most difficult part 第一步（总是最难的） 开始一项任务是最难部分的观点
(Cast the) first stone used to refer to hypocritical behavior akin to throwing a stone at someone as punishment for a crime when the thrower may be culpable for the same crime or another one 首先攻击 曾指代伪善的行为，类似于向某人扔石头作为罪行惩罚，而扔石头者可能为同样或其他罪行受到谴责
First string the group of athletes who participate from the beginning an athletic competition, as opposed to players who may substitute for first-string teammates at some point; by extension, the best among any group 正式队员 从开始参加某运动竞赛的一群运动员，与在某一时刻可能替代正式队员的替补队员相对而言；通过延伸，指代群体中最好的
(Don't) know the first thing about the model for an expression stating that someone is unacquainted with even the basics of a certain procedure or topic 一无所知 陈述某人甚至不知道某特定程序或话题基础的模范表达
First things first refers to the importance of considering the relative priority of steps 先说重要的 指代考虑步骤相对优先次序的重要性
First-timer someone engaging or participating in some activity the person has not done before 新手 从事或参加以前未做过的某活动的人
First water the highest quality, especially in gems but also said figuratively of people of high character 第一流 质量最高，尤其指珠宝，也比喻高品质的人
First world the developed, industrialized nations 第一世界 发达的工业化国家
(If at) first you don't succeed (try again) the sentiment that one should persist after initial failure 首战失利，再战一次 人在首次失败后应该坚持的观点
Ladies first a sentiment that, according to proper etiquette, females should have priority in passing through a doorway or into another area 女士优先 一种观点，根据合适的礼节，女士享有进门或进入另一区域的优先权
Shoot first (and ask questions later) referring to the supposed wisdom, in a confrontation, of disabling a potential adversary first and then ascertaining whether the person is in fact a foe 先开火 指代对抗中假定的智慧，先使潜在对手无能力，然后确定此人是不是实际上的对手
