box section bolster

例句：

1. 3. support member例句：1. The box section is crucial for the stability of the structure.
   盒子部分对于结构的稳定性至关重要。
2. 2. The engineer used a bolster to strengthen the weak spot in the beam.
   工程师使用一个支撑物来加固梁上的薄弱点。
3. 3. The new design incorporates bolsters to improve durability and strength.
   新设计采用了加强件以提高耐用性和强度。