no bottom

• n. 测深呼号未达海底

no bottom的用法和样例：

例句

1. Space has no top, no bottom; in fact, it is bottomless both at the bottom and at the top.
   太空无盖、也无底; 事实在，无论上、下都是无底的。
2. His energy has no bottom.
   他的精力无穷。