firm and impervious joint

例句：

1. 1.The engineer designed a firm and impervious joint to ensure the stability of the bridge.
   工程师设计了一个坚固且不透水的接合处，以确保桥梁的稳定性。
2. 2.The construction team worked tirelessly to create a firm and impervious joint that could withstand the harsh conditions.
   建设团队不懈努力，创造了一个坚固且不透水的接合处，能够承受恶劣的条件。
3. 3. The scientist discovered a new material that combines the strength of steel with the imperviousness of concrete, creating a firm and impervious joint.
   科学家发现了一种新型材料，它结合了钢的强度和混凝土的不透水性，创造出一种坚固且不透水的接合处。