simple supported railway bridge的用法和样例：
例句
- Under the action of all these loads, we can determine the angles of rotation at the ends of each simple beam.
在所有这些荷载作用下，我们可以确定每根简支梁端头的旋转角。 - One possibility is to select the reactions at the intermediate supports as the redundants, in which even the released structure is a simple beam.
一种可能的方法是选择中间支承处的反力作为赘余力，在这种情况下，其释去了赘余约束的结构为一简支梁。
