添加一个瞬间速率变化给刚体，忽略它的质量。
Add an instant velocity change to the rigidbody, ignoring its mass.
地价是一个区域内多种因素相互综合作用的结果，它是在动态变化过程中的瞬间量化。
Many factors had the synthetical influence on land price, and it was an instant value.
地价是一个区域内多种因素相互综合作用的结果，它是在动态变化过程中的瞬间量化。
Many factors had the synthetical influence on land price, and it was an instant value.
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