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ad. 首先, 第一, 优先
a. 第一的
num. 第一
n. 开始, 第一
【机】 第一, 一号; 第一的, 最初的
adj.
第一的
adv.
首次
num.
第一（个）

the first

first things first first aid first love first sugar first component First Lady first integral first-class first broadcast first kind first audit first-come-first-served first come first served first-ended first-out first in first out first-ready-first execute first-in-first-out first-come-first-service first-come first-serve first-in first-out first-in & first-out