Patrolling
vt.& vi. 巡逻, 巡查（patrol的现在分词形式）
🗣️ 情景例句
Nothing ventured, nothing gained.
不入虎穴，焉得虎子。
There were 15 votes in favor of my suggestion, and 23 against.
一共有十五票赞成，二十三票反对。
In his twenties Frank used to make spare parts for aeroplanes.
20多岁的时候，弗兰克曾生产飞机零配件。