Now I'm really fantastic at drawing this mechanical device, but you can imagine that dropping a weight can cause a paddle wheel to turn.
机械装置的时候，我真的很着迷，你可以想象，当重物掉落的时候会带动桨轮旋转。
Don't have space, using the weight dropping box, large zoom box.
装箱不要有空地，重物放小箱，大物放大箱。
What if the trolley can be stopped by dropping a large weight in its path from a bridge overhead?
如果这个电车可以通过从头顶的桥上扔一个大重物来停下呢？
What if the trolley can be stopped by dropping a large weight in its path from a bridge overhead?
如果这个电车可以通过从头顶的桥上扔一个大重物来停下呢？
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