常見(jiàn)例句The Driller and the Derrickman must be able to communicate at all times when the Derrickman is working on the derrick board.當(dāng)井架工在二層臺(tái)工作時(shí)，司鉆和井架工一定要能時(shí)刻保持聯(lián)系。 返回 Derrickman