为了把气体限制在一定的范围内，我们必须施加压力。

In order to confine a GAS we must apply a pressure.

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担心随后的博客设计：只有在一定的范围内，才有博客设计麻烦。

Worry about blog design later : Blog design matters, but only to an extent.

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最大时间步长对数值模拟的精度在一定的范围内影响是比较小的。

The maximum time step has a little influence on the numerical simulation precision within a limit time step.

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The military aid always has to be within a certant disatance of the president in case of emergency.

军事助理经常需要,待在总统的一定范围内,以防出现紧急情况。

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