The purpose of protothreads is to implement sequential flow of control without using complex state machines or full multi-threading. 它的主要作用是執行順序控制流，而無(wú)須復雜的狀態(tài)機或者多線(xiàn)程。
The downhole stabilizer location adjuster, fixed between the bit and the drill collar, is a special tool for continual deviation control of a slant hole. 井下穩定器安放位置調節器是斜井旋轉鉆井時(shí)實(shí)施井斜連續控制的專(zhuān)用工具，安裝在鉆頭與鉆鋌之間。
The automatic washing machine is a familiar example of a sequential control system. 自動(dòng)洗衣機是一個(gè)時(shí)序控制系統的一個(gè)熟悉的例子。
