Tickets are available on a first come, first served basis.

票先来先买，售完为止。

《牛津词典》

youdao

Sign up is first-come, first-serve.

报名先到先得。

youdao

There are worries that the crisis could be the first of more to come in other parts of the world.

VOA: special.2009.12.04

Things can't become holy and can't come into contact with the holy or the sacred if they are not first pure.

事物不可能变得神圣或是与神圣有联系,如果它们连纯洁都算不上。

耶鲁公开课 - 旧约导论课程节选

It's the outcome of a race one's running faster than all of the other guys and it's as if to have a career at all one has no choice but to come in first.

这里讲的是一项竞赛的结果,某个人比其他所有人跑的都快,就好像这场竞赛中,除了第一你别无选择。

耶鲁公开课 - 弥尔顿课程节选

"It's first come first served the way I look at it, " Charles Sweeney said.

CNN: Technology - 'Cybersquatters:' Invading big names' domains

Should we have a system of first come first serve for healthcare?

FORBES: We're All Economists Now: Scarcity Lessons For High School Students

Employees would add their name to a whiteboard outside her office and communicate and collaborate with Mayer on a first-come first service basis.

FORBES: Marissa Mayer's 'Surprise' Work-From-Home Ban Isn't A Surprise To People Who Know Her