Ocb
abbr. 油断路器（oil circuit breaker）
🗣️ 情景例句
By the way,
顺便问一声，
With time and patience the leaf of the mulberry becomes satin.
只要功夫深，铁杵磨成针。
There is only enough spring water to supply the needs of the houses, so we have to pump from the river for farm use.
泉水只能满足家庭生活用水，因此我们必须从河里抽水以用于农业生产。