侧向力 yawing force
- 这引入了更大的侧向力,并造成球路的进一步弯曲。
This introduced an even larger sideways force and caused the ball to bend further. - 如果几百人一齐走在一个狭小的空间里,而有些人刚好步调一致时,他们所产生的侧向力足以晃动一条步行桥—只是轻微晃动。
If hundreds of people are walking in a confined space, and some happen to walk in step, they can generate enough lateral momentum to move a footbridge—just a little. - 当桥的摇晃和行人的步法之间发展成一个正反馈循环时,侧向力将大幅度增加,对桥面造成剧烈晃动。
As a positive-feedback loop develops between the bridge’s swing and the pedestrians’ stride, the sideways forces can increase dramatically and the bridge can lurch violently.
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