慢性骨髓性白血病只是一种并不常见的癌症，但是正如一位癌症学家所说“它证实了一项原则。”

C.M.L. is just one, not very common, type of cancer, but, as one oncologist said, "It proves a principle."

youdao

这种风格的构造函数并不常见，它返回一个称作self的值。

This particular style of constructor is unusual in that it returns a value called self.

youdao

虽然它目前并不常见，但随着 Ajax 门户愈加流行，它也将变得频繁。

While not currently very common, it will increase frequency as Ajax portals become more prevalent.

youdao

I know this doesn't happen very often. But let's just say this happened.

我明白这种情况并不常见，但我们假设它确实发生了。

I'd better 课堂 - SpeakingMax英语口语达人