可惜我的E文太差
max大风暴中曾提到过，但是王琦为了买书在光盘中没有解释（可是我又舍不得钱去买书）
Use Chase Springs: When on, enables chase springs, which force the object to return to its original shape. When off, no chase springs are used, and the amount by which vertices move depends only on their weights. Default=on
