A computer can perform many tasks at once.
電腦能同時做多項工作。
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上馬了幾個項目。
It is a physical impossibility to be in two places at once.
同時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.
那位獲獎小說家經常是三四部小說同時寫的。