expansion opening

例句：

1. 1. The engineer designed the new building with an expansion opening for easy maintenance.
   工程师设计了这座新建筑，具有一个易于维护的膨胀开口。
2. 2.The team decided to open the doors wider during the expansion opening.
   团队决定在扩建期间将门开得更大。
3. 3.During the construction phase, the contractor had to make sure that the expansion opening was properly sealed.
   在施工阶段，承包商必须确保膨胀开口得到妥善密封。