joints of shells

例句：

1. 1. The scientist discovered a new wayto join the two pieces of metal together.
   科学家发现了一种连接两块金属的新方法。
2. 2.The team worked together to find the joints in the wall.
   团队一起工作，找到墙上的接缝。
3. 3. Thedoctor advised him to takecare of his joints andavoid overexertion.
   医生建议他照顾好自己的关节，避免过度劳累。