“水底的”用英语怎么说？

说不定他无法鉴别水底的反射信号.Maybe he can't screen out bottom return.汤川子挣扎着试图摆脱将它困在水底的冰冻.The Yukon was straining to break loose the ice that bound it down.他沿着湖边走着, 嗥叫着,水底的黄金闪烁着光芒.He walks alone round the lake where the yellow go...