entrance slit

例句：

1. 1. The scientist carefully examined the entrance slit of the spaceship.
   科学家仔细检查了飞船的入口狭缝。
2. 2. The tunnel was so narrow that only a small entrance slit could be seen.
   隧道非常狭窄，只能看到一个小的入口狭缝。
3. 3. The engineer had to make a small entrance slit in the wall to access the machinery.
   工程师不得不在墙上开一个小口子来进入机器。