1、
The sea level in this period is relatively stable, shoal head developed well.
这一时期海面相对稳定，海岸沙嘴发育。
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2、
During dry period, Qianzhou Shoal scours with the head back off and the tail going up.
尾部下挫；而枯水期冲刷，头部后退，尾部上提。
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