When problems occur, they are usually due to clear overloading or underloading; but a relatively wide range of operation is possible between these extremes.
通常出现问题是过载或欠载引起的，但是在允许值之间的相对范围是比较宽的。
When problems occur, they are usually due to clear overloading or underloading; but a relatively wide range of operation is possible between these extremes.
通常出现问题是过载或欠载引起的，但是在允许值之间的相对范围是比较宽的。
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