reference test bar的用法和样例：
例句
- Test bars are usually cast for each heat, but their analysis may be inconclusive.
测试杆通常针对每个温度，但是它们的分析可能是不确定的。 - It shall have a test lever and the valve shall be guided to enhance reseating and to decrease chance of the seat being misaligned.
这种阀门配置测试杆，阀杆通过导轨引导，能够实现更好的阀座再密封，降低阀座对齐不准的可能性。
