Unpledged
a. 未經保證的,未許諾的
??? 情景例句
The weather really sucks today.
今天的天氣真差。
Super fun.
很好玩的。
and we control it by means of the mud which we circulate down the drill pipe.
我們讓泥漿順著鉆桿向下循環，用這種方法來控制壓力。