The tension can never be negative.
张力不能为负数。
Well it could go twenty basis points lower but interest rates can never be negative.
呃，它可以再跌二十个基本点，但是利率永远不能是负值。
In particular, the speed of the Moon around the Sun will never be negative, so the Moon will never loop backwards.
特别是月球绕行太阳的速度决不可能是负的，所以月球永远不会向后打转。
In particular, the speed of the Moon around the Sun will never be negative, so the Moon will never loop backwards.
特别是月球绕行太阳的速度决不可能是负的，所以月球永远不会向后打转。
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