Don't depend on the lack of a minus sign to mean that there are no negative Numbers.
不要根据没有减号这一条件就认为不会有负数。
There could be a lot more, for instance no negative numbers or no percentages over 15.
还有更多的限制，例如不出现负数或百分比不大于 15 的限制。
When a suBstance has no net electrical charge, the total numBers of positive and negative charges within it must just Be equal.
当物质没有净电荷时，它内部的正负电荷总数必定正好相等。
When a suBstance has no net electrical charge, the total numBers of positive and negative charges within it must just Be equal.
当物质没有净电荷时，它内部的正负电荷总数必定正好相等。
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