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In fact, it's so difficult that drug companies have hardly ever tried.
事实上, 这一过程如此困难,使药物公司几乎从来没敢尝试这么做.
英汉非文学 - 生命科学 - 回顾与展望
At night, when all the windows are lit up, the hardness of the daytime is softened.
夜晚, 当千家万户的窗子被灯光照亮之时, 白天那种硬邦邦的感觉就缓和下来了.
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