joint method of agreement and difference

例句：

1. 1. The car's engine is a complex joint of metal parts.
   汽车的引擎是一个复杂的金属部件的结合。
2. 2. The team worked together to achieve the joint goal.
   团队共同努力实现了共同的目标。
3. 3. The two countries have been working on a joint project for years.
   这两个国家多年来一直在合作一个项目。