“先来后到”，汉语成语，按照来到的先后而确定次序，可以翻译为“in order of arrival”。与英文惯用语“first come, first served”意思相近，表示“the first people present will be the first to receive something”。

例句：

该系统注册完全依照先来后到的顺序运作。

The registration system was entirely first come, first served.

买票应该有个先来后到。

The tickets should be bought on a first come, first served basis.

应聘者将按先来后到接受面试。

The applicants will be interviewed in order of arrival.