名词短语
中文翻译：分层床离子交换
同义词：
['stratified soil', 'layered soil', 'stratified sediment']
例句：
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1. The stratified bed is ideal for studying the movement of groundwater.
分层床非常适合研究地下水的运动。
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2. The stratified bed was formed by the slow accumulation of sediment over millions of years.
分层床是由数百万年缓慢沉积物积累形成的。
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3. The stratified bed is a unique geological feature that has been studied for decades.
分层床是一种独特的地质特征，几十年来一直受到研究。