对于他们来说，好消息是事情没有变的更坏；坏消息是没有变坏的原因是它不能变得更坏了。

The good news for them is that things are not getting worse; the bad news is that this is because they cannot deteriorate any further.

youdao

对于三岁的孩子来说，由于一些原因，他们的成绩并没有得到改善，只是因为改变而略有下降。

For three-year-olds, for reasons that are still in need of clarification, no improvement—rather a slight drop in performance resulted from the change.

youdao

他在信中写道，检查遇到了困难，原因是，对于经调查确认造成这种气味的化学物，几乎没有实验室能够测试得出来。

The investigation, he wrote, had been challenging because there were very few research labs able to test for the chemical later identified as the cause of the smell.

youdao

None of these do we have vaccines for, and it's turned out that sexually transmitted diseases for a variety of reasons, we'll come back to later, are particularly difficult to develop vaccines for.

这些病我们都没有疫苗,已经证明,对于性传播疾病,有很多原因使得,我们稍后回来再讲,针对这类疾病的疫苗特别难做出来

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