应用汽车优化调度系统,提高生产效率和综合效益显著,但究竟汽车调度系统技术因素占多大比例很难说清楚.
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There's a great deal of suspicion and fear, and it's hard to say when all of this will simmer down
人们疑心重重，惶恐不安，很难说这一切什么时候会平息下来。
《柯林斯高阶英汉双解学习词典》
Whether Windows Phone [ will be] successful is difficult to say – it has a very small market share.
windows phone是否会成功很难说，其市场份额非常小。
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阳光照在她光泽的头发上，给它涂上一层金属似的光彩。很难说出它究竟是颜色，是深褐色，黑色。
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突然间，阳光显得格外灿烂，照在她光泽的头发上，给它涂上一层金属似的光彩，很难说出它突竟是什么颜色，是深褐色，还是黑色。
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And you can't tell me they banked that money in the name of the Confederacy.
而且很难说他们存钱时是用的联盟政府的名义.
飘（部分）
But the doctors here found it difficult to convince the women taking contraceptive pills.
但医生发现很难说服这里的女子们服用避孕药丸.
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It is difficult to convince him : he is as obstinate as a mule.
(他倔强得象一头骡子,很难说服他.)这里用amule(骡子)比喻顽固的人.
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Middlesex cricketers Gatting and Emburey are hardly flavour of the month.
米德尔塞克斯郡板球选手盖廷和恩伯里很难说是当红人物。
《柯林斯高阶英汉双解学习词典》
It's hard to say. Tokyo is both noisy and quiet, with and tranquil back streets.
雪:很难说. 它既吵闹又宁静, 有喧哗的大街,也有宁静的小巷.
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