1. at once 立刻
= right away
2. be at once + 形容詞 + and + 形容詞 不僅...而且...
= not only...but (also)...
3. all at once 突然間
= all of a sudden
= suddenly
= right away
2. be at once + 形容詞 + and + 形容詞 不僅...而且...
= not only...but (also)...
3. all at once 突然間
= all of a sudden
= suddenly
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