Instead of just piling the oysters up close to the riverbed, as had been done in the past, they built reefs of various heights above the bed for them to grow on.
他们没有按照过去通常的作法仅仅将牡蛎在靠近河岸处一层一层地摞起来，而是在河床上建造了高度各异的(供牡蛎生长的)牡蛎礁。
Prevent from enlarging vibration resulting from piling up frequency and close frequency. Improve mechanical dynamic condition.
防止因叠加频率，频率相近而产生的振动力放大，改善机械的动态条件。
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