Within the cloud, some parts are sufficiently dense to start collapsing under their own gravity.
2
跳伞是一种根据自身重力下坠的过程，所以没有所谓的那种失重感。
Skydiving is a process of self gravity falling under, there is no such thing as a kind of sense of weightlessness.
3
鉴于此，提出了一个不外设动力源，而仅靠油管和结构自身重力来实现分离油管的机构。
In this article, a new mechanism, which has no additional power source and carries out tubing separation by the sole weight of the tubing and the mechanism, is presented.
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