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。
It is true, I never assisted the sun materially in his rising, but, doubt not, it was of the last importance only to be present at it.
诚然，我从未在太阳升起时助过它一臂之力，但是，见证日出本身就是一件至关重要的事，这一点不容置疑。
Sunscreen should never be used to prolong the duration of sun exposure.
绝不将防晒霜用于延长暴露于太阳的时间。
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