low tide period 低潮时期
The siliceous rocks of the lower Mantou formation were resulted from the biochemical action during the sedimentary period and formed in the environment of low-tide shallow sea.
结果表明，镘头组下部的硅质层是同生期生物化学作用成因的，形成于潮下低能浅水环境；
A surfer, and a self-taught chef creates his breathtaking geometric sand sculptures freehand with a length of driftwood during the period of low tide.
这位冲浪爱好者，同时是一位自学成才的厨师，在退潮时，凭借一根浮木徒手创作了这些令人惊叹的几何沙雕作品。
According to forecast, water flow shall be low during dry period of 2006-2007 and water supply in the Pearl River Delta shall be threatened by salty tide again.
据预测，珠江流域2006—2007年度枯水期来水依然偏枯，珠江三角洲地区将因咸潮继续面临严峻的供水局面。
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