Jones尝试寻找其他的稳定效应来解释，最后得到一个结果，与购物车的脚轮的原理接近。
Jones looked for another stabilizing effect and found one similar to that which keeps the casters of shopping carts lined up.
Jones尝试寻找其他的稳定效应来解释，最后得到一个结果，与购物车的脚轮的原理接近。
Jones looked for another stabilizing effect and found one similar to that which keeps the casters of shopping carts lined up.
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