Your browser does not seem to support JavaScript. As a result, your viewing experience will be diminished, and you have been placed in read-only mode.
Please download a browser that supports JavaScript, or enable it if it's disabled (i.e. NoScript).
假如约束太弱的话，就是会漂出去一段距离，也和实际情况相符。可以提高约束刚度试试。
