I can measure that, because I pull it by one centimeter and I find the acceleration it exerts on a known mass.
我可以测量它了,因为我把它拉到了一厘米,我发现它对一个已知质量施加的加速度。
I had discovered the baboon trails where I could pull myself up the steepest parts by roots.
我发现了狒狒的足迹,在那里我可以用树根把自己拉到最陡峭的地方。
Many of the animals die when people harvesting other kinds of fish pull in sharks by accident.
VOA: special.2009.06.16
Even in the case of this spring, when you pull it, if you pull it to the right by some force.
甚至是在这样的弹簧问题中,当你拉它的时候,如果你用力向右拉
I draw a graph here of the amount by which I pull the spring versus the force it exerts.
我在这里画个图,纵轴是弹簧的拉伸量,横轴是力的大小
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