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(chǔ)。

　　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(qiáng)有力的政治基點(diǎn)來(lái)挑戰(zhàn)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(quán)會(huì)給投資者提供更長(zhǎng)的利潤(rùn)積累期。