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hidden current
The main mechanisms of hyporheic exchange include pumping exchange and turnover exchange.
An undertow is when the water returns to the ocean underneath the incoming waves.

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Open the tool →潜流 (qián liú) means “undercurrent, hidden current”.
潜流 is pronounced qián liú in Mandarin Chinese.
“undercurrent” is 潜流 (qián liú) in Chinese.
This page has 2 example sentences using 潜流, each with pinyin and an English translation.