词汇	天然硝石
释义	天然硝石 soda nitre
随便看	self-threading pin self threading reel self-threading reel self threading screw self-threading screw self threading shuttle self-threading shuttle self threading tape self-threading tape self-thrombus self-tigh selftight self tight self-tightening self-tightening drill chuck selftightening grip self-tightening lever clip self-tightening locknut self tightening oil seal self-tightening oil seal self tightening rectal swab holder self tightening seal self-tightening seal selftimed self-timed