换届的英文：
change personnel upon completion of a term of office

change是什么意思：
n. 变化；交换，交替；零钱
v. 改变；交换，替换；兑换；更换

change a bed;change the baby.
换床单；给婴儿换尿布

We propose 'a change [making a change / to make a change / that a change should be made].
我们建议应做一点改变。

The change of quantity can causes the change of quality.
量变可以引发质变。

personnel是什么意思：
n. （总称）人员，员工；人事部门

We have the qualified fireman personnel.
我们有合格的司炉人员。

Tens of thousands of professional personnel
数以千万计的专门人才。

Many personnel managers started as secretaries or personnel assistants and worked their way up.
很多人事经理最初是从秘书或人事助理做起，然后慢慢升上去的。

upon是什么意思：
prep. 在...上；紧接着；逼近；根据；走上...；爬上...

He stepped upon the alter.
他走上圣坛。

To bear hard upon;press.
使痛苦不堪对某人施加困难；逼迫

press hard upon
进逼|压迫|穷追