表层沉积物 surficial sediments ; surface sediment samples
表层堆积物 surface deposit ; Deposit surface
有机物地表层 gas spurts
表层性浮游生物 autopelagic plankton
表层浮游生物 epiplankton
海底表层沉积物 sea floor sediments ; submarine sediment
冬季表层浮游生物 chimopelagic plankton
表层沈积物 surficial sediment
表层氧化物层界面 Surface oxide layer interface
表层聚合物熔体形成 skin polymer melt forming
石油和天然气的密度都比水小，所以二者通常会浮在被水浸泡的岩石和沉积物的表层。
Both oil and gas are less dense than water, so they generally tend to rise upward through water-saturated rock and sediment.
这些表层堆积物覆盖面积达10平方公里（4平方英里）；
those deposits cover more than10 square kilometers (4 square miles).
我们的皮肤在不停地剥落——每个人每两到四周就会更换一次表层皮肤——而所有那些脱落的皮肤可以帮助减少室内环境中的某些污染物含量。
We shed skin constantly — each of us replacing our outer layer of skin every two to four weeks — and all of those skin flakes may help reduce levels of certain pollutants in indoor environments.
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