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胜败乃兵家常事。Some battles you win, some battles you lose.所有证据都表明该犯罪乃他们所为.The sum of evidence points to the crime resting on them.尽快寻求帮助和建议乃明智之举。It is wise to seek help and counsel as soon as possible....

“乃”的拼音为：nǎi...