单词	petroleum class
释义	petroleum class 石油类
随便看	keep on good terms with sb keep on ice keep on-ing keep on its feet keep on keeping on keep on laughing Keep only one male with several females keep on moving keep on one's feet keep on one's toes Keep on peaching keep on practice keep on record Keep On Singing My Song Keep on studying English keep on the course keep on the go keep on the rails keep on the razor-edge of something keep on the right side of keep on the right side of sb keep on the right side of someone keep on the right side of the law Keep on the right side of the road keep on the straight and narrow