The pass percent of the water quality after sewage treatment in Weigang Combination Station in 2003is only70%, which forms the severe threat on the stratum layer' s safety.

2003年，魏岗联合站污水处理水质合格率只有70%，严重影响到魏岗油田注水合格率，对地层安全形成了极大的威胁。

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These layers are called strata and a single layer is called a stratum.

这些岩层被称作地层（strata）（stratum的复数形式）， 单个岩层称为stratum。

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"When we are in the bath and we have been there for a while the stratum corneum [outer] layer of our skin expands," says Evans. "This causes wrinkles and means our fingerprints will be enlarged also."

“泡浴时，我们皮肤的角质层(外层)会有那么一刻时间扩张开来，”埃文斯说，“这导致我们的指纹出现皱纹或者扩张的情况。”

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