Stratification in polar water normally is weak and transient.
極地水域的成層性是微弱而暫時的。
Stratification in polar waters normally is weak and transient.
極地水域的成層性是微弱而暫時的。
The stratification of beach deposits has been studied particularly.
對海灘沉積物的層理進行了著重研究。
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