reference test bar的用法和樣例：
例句
- Test bars are usually cast for each heat, but their analysis may be inconclusive.
測試桿通常針對每個溫度，但是它們的分析可能是不確定的。 - It shall have a test lever and the valve shall be guided to enhance reseating and to decrease chance of the seat being misaligned.
這種閥門配置測試桿，閥桿通過導軌引導，能夠實現更好的閥座再密封，降低閥座對齊不準的可能性。
