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》
...'difficult' patients who have the temerity to challenge their doctors' decisions.
胆敢不遵医嘱的“难缠”病人
《柯林斯高阶英汉双解学习词典》
我们许多人感觉很难用语言表达自己的需求,希望别人能通过心灵感应了解我们的感受。
《柯林斯高阶英汉双解学习词典》
I have to stay awake and study all night to keep up with these difficult classes?
要赶上那些困难的课程,我必须通宵熬夜学习.
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个人取得的所得, 难以界定应纳税所得项目的, 由主管税务机关确定.
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