He has four weeks in which to lodge an appeal.

　　他有4個(gè)星期的時(shí)間提出上訴。

　　We will then have a firmer foundation of fact on which to build theories

　　那樣我們將會(huì )獲得一個(gè)建立理論所需的更為牢固的事實(shí)基礎。

　　The post will give him a powerful political base from which to challenge the Kremlin

　　這個(gè)職位將給他提供一個(gè)強有力的政治基點(diǎn)來(lái)挑戰克里姆林宮。

　　We guarantee that you will find a community with which to socialise

　　我們保證你們會(huì )找到自己的交際圈。

　　Officials say the options will offer investors a longer time in which to accrue profits.

　　官員說(shuō)這些期權會(huì )給投資者提供更長(cháng)的利潤積累期。