expand tube joint with tubesheet

例句：

1. 1. The company plans toexpand its operations in the new market.
   该公司计划在新的市场上扩展其业务。
2. 2. Theteam expanded their knowledge of the subject byreading more books.
   通过阅读更多的书籍，团队扩大了对主题的了解。
3. 3. The economyis expanding at a faster pace than expected.
   经济正在以比预期更快的速度扩张。