词汇	m curve
释义	m curve M曲线
随便看	keep sth.in the background keep sth off keep stick to keep still Keep still while I comb your hair Keep still while I fasten your shoe keeps to keeps to oneself keeps touch with keep straight on Keep straight on until you get to the church Keep straight to the lighthouse keep strictly to the terms of the contract keep strict watch keep stroke keep stroke! keep the books Keep the bottle upright Keep the buoy on port side keep the buoy on port side! Keep the buoy on starboard side Keep the buoy on starboard side! keep the button keep the button depressed keeps track