sectional operation

• 分段

sectional operation的用法和样例：

例句

1. The sectional cutting method is effectively applied to longhole raising but less applied to tunnel heading.
   分段掏槽法已在深孔爆破掘进天井运用中取得一定效果，而在平巷掘进中运用却未予以足够的重视和研究。
2. The short tailstock and the sectional rear light also command looks like the movement.
   短小的车尾和分段式尾灯也令看起来很运动。