joint cross

例句：

1. 1. The doctoradvised him to exercise regularly to prevent jointpain.
   医生建议他定期锻炼以防止关节疼痛。
2. 2. The carpenter used a jointsaw to cut the wooden beams forthe bridge.
   木匠使用连接锯来切割桥梁的木梁。
3. 3. The scientist discovered anew way to join two pieces of metaltogether using a special glue.
   科学家发现了一种使用特殊胶水将两块金属连接在一起的新方法。