例句：

　　The central bank should also serve as as a lender of last resort to the money market.

　　中央銀行應(yīng)該在金融市場(chǎng)中扮演最終貸款人的角色。

　　PHP has an array type that doubles as as a simple list and a dictionary or hash; Python separates the two.

　　PHP的數(shù)組類型可同時(shí)支持簡單列表和字典或散列，但Python卻將這兩者分開。

　　Think of it as as if you were buying an expensive car: a test drive is crucial before making a final decision.

　　例如，你想買一輛高級(jí)轎車，下決心前的試驗(yàn)駕駛就是至關(guān)重要的。