He has four weeks in which to lodge an appeal.

　　他有4個星期的時間提出上訴。

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

　　那樣我們將會獲得一個建立理論所需的更為牢固的事實基礎(chǔ)。

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

　　這個職位將給他提供一個強(qiáng)有力的政治基點來挑戰(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.

　　官員說這些期權(quán)會給投資者提供更長的利潤積累期。