rim of tube

例句：

1. 1. The engineer carefully measured the rim of the pipe to ensure it was straight.
   工程师仔细测量了管子的内壁，以确保它直。
2. 2.The scientist studied the rim of the crystal to understand its structure.
   科学家研究晶体的内壁，以了解其结构。
3. 3. The carpenter repaired the rim of the door to make it watertight.
   木匠修理了门的内壁，使其防水。