他们应该保持在孩子们叫一声就能听得到以及能马上跑过去的距离之内。
They should always be within shouting and running distance of their children.
短距离之内，你可以在墙上移动。
请保持在听得见的距离之内。
这些碎片预计在周二与空间站的距离在半英里之内。
The debris is projected to come within a half mile the space station on Tuesday.
这些碎片预计在周二与空间站的距离在半英里之内。
The debris is projected to come within a half mile the space station on Tuesday.
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