So you saw in a striking example of where friction helped us to balance, and now I want to discuss an object that is hanging and that can freely swing due to gravity.
这就是著名的靠，摩擦力平衡的例子，现在我想讨论一个，可以在重力作用下，自由摆动的悬挂物体。
A child on a swing looked up at the scream and saw something like a small boy rolling and holding and falling fast through the branches of the pine tree.
一架荡秋千上，有一名孩子抬头朝尖叫声发出的地方看去，看到似乎有一名小男孩在松树的树枝当中翻滚、抓住树枝、迅速下落。
I had a dream that I was playing on my swing and then I saw a rollie pollie and a butterfly.
中文的大意为：“我做了个梦，梦见自己在荡秋千，这时看见了一只小潮虫和蝴蝶。
By the method of sawing and saw blade swing taking the line of saw-teeth of saw blade's working side for centre, saw blade always works toward the tangent of sawing curve.
采用锯机连同带锯条一起以带锯条工作边锯齿齿尖连线为中心作回转摆动的方法，实现带锯条始终沿着锯切曲线的切线方向进行锯切。
As soon as they saw that we had secured him, they would swing around the corner, pick us up and take off.
一看见动手就从拐弯那边冲过来，拉上我们就跑。
As soon as they saw that we had secured him, they would swing around the corner, pick us up and take off.
一看见动手就从拐弯那边冲过来，拉上我们就跑。
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