Since they're difficult to copy, the serial number should tip off a counterfeit bill.
而序列号又难以复制, 因此通过它可以检验出假钞.
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省时省力, 效益高, 特别适用于人手短缺招工难的地方.
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How many doses and in what time frame I think it is probably the difficult question.
我认为提供多少和在什么时候提供这可能还是个难题.
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Although Dell's Beishuiyizhan eighth win in difficult, but the key is lost in the tie breaker.
背水一战的戴尔虽在第八局中艰难胜出, 但在关键的决胜局中还是败下阵来.
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与潮汐的简单观测不大相同, 潮流研究的难度既大、费用也巨.
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It has been difficult for scientists tonail down thew cause of this disease.
科学家一直无法找出导致这个疾病的原因.
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He was a terror. He had been a difficult child for as long as his parents could remember.
他是个淘气鬼,从小就不老实。
《柯林斯高阶英汉双解学习词典》
We'll find these students truely having a difficult time when we think back of their situation.
其实我们回过头来想想,这些留美高中生其实也非常不容易.
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