because of his carelessness
因为他的粗心
以上为机器翻译结果，长、整句建议使用 人工翻译 。
Because of his carelessness, he lost 3 points in math.
由于他的粗心大意，他在数学上丢了3分。
youdao
He failed because of his carelessness.
由于粗心大意，他失败了。
He lost the chance because of his carelessness.
他因粗心大意而失去了机会。
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