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。
The magnitude and direction of force could not change the trend of the stress distribution.
牵引力的大小、方向基本不改变应力的分布趋势。
By investigating the direction of force acted upon particles and the direction of fluid flow in the classifier, the concepts of cross flow classification and reverse flow classification were proposed.
考察了分级过程中颗粒所受的力场和介质流体的流动场，分析和比较了与之对应的两种不同形式的分级，即颗粒物料的逆流分级和错流分级。
By investigating the direction of force acted upon particles and the direction of fluid flow in the classifier, the concepts of cross flow classification and reverse flow classification were proposed.
考察了分级过程中颗粒所受的力场和介质流体的流动场，分析和比较了与之对应的两种不同形式的分级，即颗粒物料的逆流分级和错流分级。
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