礁建造
Reef construction
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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。
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.
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