C: Do you think it is difficult to learn a foreign language?

你觉得学一门外语难吗？

youdao

Prof. Jensen : I think it is difficult to develop global guidelines for hepatitis C treatment for several reasons.

我认为很难制定全球丙肝治疗指南，原因有几个。

youdao

The existing methods are powerless for ingenious C codes. It is difficult to understand codes generated by some transformation system.

已有的方法大多不能处理含有技巧的指针代码，转换生成的代码难以理解，往往无法正确执行。

youdao

So if you're trying to make a more complicated organic molecule carbon-carbon bonds are one of the most difficult things to make in organic chemistry, and it turns out that c n minus is a very reactive molecule, so it's a good way, even though we'll go over some drawbacks in a second, it is a good way to make carbon-carbon bonds.

如果你要合成一个更复杂的有机分子,碳碳键是有机化学中,最难制造的键之一，而实际上氰离子是一种具有很高活性的分子，用它是一个好办法，尽管我们一会儿将看到它的一些缺点，但它的确是一个制造碳碳键的好方法。

麻省理工公开课 - 化学原理课程节选

When we hear about companies like Amtrak, Borders and Circuit City, just to pick an A, B and C at random, it is difficult to understand.

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One reason is that the flat geometry of the hepatitis C protease protein made it is difficult target to hit with small-chemical drugs.

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