bidirectional block

例句：

1. 1. The engineerdesigned a bidirectional block to preventwater from flowing backwards.
   工程师设计了一个双向阻塞块，以防止水流反向。
2. 2. Theconstruction crew used the bidirectional blockto stabilize the foundation of the new building.
   施工队使用这个双向阻塞块来稳定新建筑的基础。
3. 3. The bidirectionalblock was crucial in preventing the leak fromspreading further.
   这个双向阻塞块在防止泄漏进一步蔓延中起到了关键作用。