Strong earthquakes come from sea level oscillation.
强震起源于海平面振荡。
The seasonal sea level change is of annual period and the second oscillation is of semi-annual period.
月平均海面以年周期振动为主，其次是半年周期。
The main towers made of steel reached 297 m above the sea level and were erected with high accuracy while oscillation by the wind was carefully suppressed.
钢结构的桥塔矗立于海面以上297米，结构采取了良好的制风振措施。
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