1.at once 立刻;馬上;立即
He took off at once and headed back to the motel.
他立刻離開,回到汽車旅館 。
Remove from the heat, add the parsley, toss and serve at once.
端離爐子,加上歐芹,顛起翻面后就立刻上桌 。
2.such as 例如;諸如
Issues such as these were not really his concern.
他其實并不關心諸如此類的問題 。
They offer tips on topics such as home safety.
他們就家居安全等問題提供建議 。