external layer短语¹³¹⁶²⁰⁺³ 基本例句 外部层次 The gas pushes out the external layer of armour so that it encounters the emerging spike at a glancing angle. 气体排放在装甲车的表面，以致于一看过去就像遭到新型弹道一样。 ecocn Objective:To study the anatomic morphology of permanent tooth external layer of Korean-nationality. 目的：研究朝鲜族恒牙外层解剖形态。 chemyq