trough core

例句：

1. 1. The trough core is used to support the weight of the roof.
   槽钢芯用于支撑屋顶的重量。
2. 2. The construction of the bridge required a strong trough core.
   建造这座桥需要强大的槽钢芯。
3. 3. The engineer carefully selected the trough core to ensure its strength and durability.
   工程师仔细选择了槽钢芯，以确保其强度和耐用性。