先到先得的英文：
First come, first served

参考例句：

Please note that Quota limits to 50 persons and the enrollment is done on a first-come-first-served basis.
请注意,名额仅50位,先到先得。

first是什么意思：
adj. 第一的；最初的
adv. 第一，最初；首先；宁愿
n. 显着成就；第一个人或事物

the First International
第一国际（1864－1876）

first approximation
第一次近似;第一近似值;初步近似;一次近似值;一级近似;首次近似

There was a hush at first.
先是一阵寂静。

come是什么意思：
v. 来；发生；开始；出现；变成；达到；来做；来取；来拿
int. 嗨，得啦，好啦

The bale will be coming.
不幸就要降临了。

Come on get with it!
好啦，时髦点儿吧！

Illness comes in by mouth and comes out by it
病从口入祸从口出

served是什么意思：
[ serve ]的过去式

to serve the landlord
为地主干活

Persons serving on the Appellate Body shall serve in rotation.
上诉机构人员任职应实行轮换。

They drafted him to serve as their delegate.
他们选派他作他们的代表。