Upper and lower limits of the alarm can be set freely;
报警上限和下限任意设定；
The upper and lower limits of an airway shall be also defined.
航路还应当确定上限和下限。
There are practical upper and lower limits of power for telescopes.
在实际使用中，望远镜有上限和下限放大率。
There are practical upper and lower limits of power for telescopes.
在实际使用中，望远镜有上限和下限放大率。
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