It is difficult to set down an exact formula because cork is a natural product.
要确定脱模剂的精确配方是困难的,因为软木是一种天然产物.
来源:词典精选例句English is rich in synonyms , which are difficult for English learners to master.
英语中有大量的同义词, 是英语学习者学习词汇的难点.
来源:期刊摘选They were both red in the face and found looking at each other difficult.
他们俩全都涨红着脸,难以互相正视.
来源:词典精选例句It is difficult to make an accurate count of the stone lions in the Lugou Bridge.
卢沟桥的狮子极不容易数清.
来源:互联网摘选At the start the work seemed complex, difficult, heartbreakingly slow.
开始时这件工作似乎十分复杂困难, 而且慢得令人伤心.
来源:词典精选例句It is difficult to make an accurate estimate of the total available power in the world.
要对世界上全部可用的水力作出精确的估计是困难的.
来源:互联网摘选
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