first-come和first-served分别是什么意思？

first-come，first-served先到先得，例句:

1.Bymakingalldesksavailableonafirst-come,first-servedbasis."秘诀在于：他们按照先到先得的原则给员工分配座位。

2.Freeadmissionsessionsandforumsareofferedonafirst-come,first-servedbasisandpriorregistrationisrequired.免费入场的论坛及会议名额有限，必需预先登记。