Reef flat, reef crest and reef front margin can be recognized in the reef core facies.

礁核相包括礁坪带、礁冠带和礁前缘带。

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On the section, the imbricate thrust zone is situated below the front margin of the triangular-zone structure, and they are overlapping distributed on plane.

在剖面上，叠瓦冲断带位于三角带构造的前缘下方，平面上呈重叠分布。

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Although gross margin was reduced up front, the bottom line impact of avoiding all the costly end-of-season retail returns actually improved the company's bottom line.

虽然在最前面总利润会下降，但是避免所有季末零售退货影响的底线实际上会提高公司的底线。

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"The only slight cause for concern is on the margin front, " he added.

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