It is a system overhead and must be simple to operate, high performing, and cost-effective.
它是一种系统开销，所以必需要操作简单、高效和经济的。
If it is high, it must be reached.
如果它很高，我一定要伸手构到它。
"It must be forty feet high," said they, grimly; and never moved.
“肯定有四十英尺高，”他们冷淡地说，却一动也不动。
It must be because of her high heels too.
也因为是她高跟鞋太高。
It must be because of her high heels too.
也因为是她高跟鞋太高。
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