It would also be useful to define a valid range for an int value.
而且，为一个int值定义一个有效范围也很有用。
That is very useful for the load, which changes frequently and in a wide range.
这对于变化频繁且变化幅度大的负荷，很有实用价值。
Elephants are useful, but there is only so much range that bows can have.
大象很有用，而弓箭的射程就那么远。
Elephants are useful, but there is only so much range that bows can have.
大象很有用，而弓箭的射程就那么远。
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