... a once powerful nation 曾经强盛过的国家。 when once he understands 他一旦了解时。 O- you begin you must continue. 一旦开始你就不可以中断了。 ...
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when once he understands
一旦他明白
以上为机器翻译结果，长、整句建议使用 人工翻译 。
Lucky is very clever and understands many English words. He can understand me when I give him orders. For example, I say, "Lucky! Get my book," and he does it at once.
“幸运”非常聪明，能理解许多英语单词，当我发命令时，它能理解我的口令，比如，我说，“幸运”，拿书来，它立即去做。
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