Since it is not easy to judge the direction of force in a fall, much less the extent of force, the belayer must evaluate each situation and make use of the rock for the most secure position.
由于在降落过程中很难判断受力的方向，更不用说受力的大小，因此保护者必须对每一种情况进行估量，并利用岩石取得最安全的位置。
You can use it for any purpose, but if you're in a position to enjoy some of your savings now, make the goal something fun like a vacation.
你可能会拿他们做任何用途，但是，如果你正在享受的是你的储蓄，要让你的目标像度假一样快乐。
In addition, these approaches of physical simulation only make use of the position randomicity to increase variation.
另外，现有的基于物理的动画方法仅仅考虑利用位置随机性来增加变动。
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