A computer can perform many tasks at once.

　　電腦能同時(shí)做多項(xiàng)工作。

　　She fell in with my idea at once.

　　她立刻同意了我的主意。

　　We have several projects all on the boil at once.

　　我們熱火朝天地同時(shí)上馬了幾個(gè)項(xiàng)目。

　　It is a physical impossibility to be in two places at once.

　　同時(shí)身處兩地在自然法則上是不可能的。

　　He couldn't reasonably be expected to pay back the loan all at once.

　　公平合理地講，不可能指望他一下子歸還全部借款。

　　The award-winning novelist often has three or four books on the go at once.

　　那位獲獎(jiǎng)小說(shuō)家經(jīng)常是三四部小說(shuō)同時(shí)寫的。