external surface

• 外表面

external surface的用法和样例：

例句

1. The pipe must be cut perpendicularly to its axis and its external surface deburred.
   管件必须根据坐标轴纵切割且外表面去毛刺处理。
2. These tears activate cells on the outer surface of the muscle called satellite cells.
   这些破损将刺激肌肉外表面上的被称作卫星细胞的细胞。