The flake crack initiated in surface layer and developed in subsurface stratum.

剥落裂纹起源于表面，在亚表层中扩展；

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The flexural fatigue property of steel fiber reinforced concrete material for the pavement surface stratum is investigated experimentally.

对路面用钢纤维混凝土材料的弯曲疲劳进行了试验研究。

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Research of static correction method and investigation technology about the surface stratum structure of huge thick gravel area of front-zone of mountain.

山前带巨厚砾石区的表层结构调查技术及静校正方法研究。

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She told him (and the rabbits that sometimes surreptitiously accompanied the riders) that people were becoming more and more unbalanced: studies had proved it, which led the psychiatrist to conjecture that perhaps mental instability was not so much a disease as a stratum of normality, just below the surface of normality as it was commonly conceived.

NEWYORKER: The Insufferable Gaucho