solidness

例句：

1. 1. The new car has a solidness that makes it very reliable.
   这辆新车非常可靠，因为它的坚固性。
2. 2.The old building was made of solid wood, which is why it lasted so long.
   这座旧建筑是用坚硬的木头建造的，这就是为什么它能保持这么长时间的原因。
3. 3. The engineer tested the machine's solidness to ensure it could withstand heavy loads.
   工程师测试了机器的坚固性，以确保它能承受重负载。