Instead of just two tides a day like in a marsh, the gravel is flooded and drained 16 times a day to boost bacterial activity.

与沼泽池每天两次的潮汐不同的是，为促进微生物的生长，这些砂石层在一天中会经历16次的充满和放空。

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Instead of just two tides a day like in a marsh, the gravel is flooded and drained 16 times a day to boost bacterial activity.

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