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."
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.
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.
需要覆写这个方法的案例并不常见，因为它需要您来修改预设的配置系统行为。
The scenario where overriding this method would be necessary is not common, because it requires you to modify the default layout system behavior.
需要覆写这个方法的案例并不常见，因为它需要您来修改预设的配置系统行为。
The scenario where overriding this method would be necessary is not common, because it requires you to modify the default layout system behavior.
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