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水底

bottom of the water, underwater

ʂ u̯ e ɪ̯ ² ¹ ⁴ ⁻ ³ ⁵ t i ² ¹ ⁴ ⁻ ² ¹ ⁽ ⁴ ⁾
noun Rare #29,192
bottom of the water, underwater Refers to the bottom beneath a body of water or to the underwater area.
CH: 鱼在水底游。
EN: The fish is swimming underwater.

目标在水底

The target is underwater.

— 美人鱼 (2016)

沉到水底去

Sink to the bottom of the water.

— 美人鱼 (2016)

水底是可以行的

You can walk underwater.

— 幽灵公主 (1997)

Sounds similar to

水里 ʂ u̯ e ɪ̯ ² ¹ ⁴ ⁻ ³ ⁵ l i ² ¹ ⁴ ⁻ ² ¹ ⁽ ⁴ ⁾