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1.at once 立刻；马上；立即
He took off at once and headed back to the motel.
他立刻离开，回到汽车旅馆。
Remove from the heat, add the parsley, toss and serve at once.
端离炉子，加上欧芹，颠起翻面后就立刻上桌。
2.such as 例如；诸如
Issues such as these were not really his concern.
他其实并不关心诸如此类的问题。
They offer tips on topics such as home safety.
他们就家居安全等问题提供建议。
