单词	practical origin
释义	practical origin 实践渊源
随便看	single Kalman filter single kayak single kernel cumulative drop planter single-kernel cumulative-drop planter single key single-key single-keyboard point-of-sale system single key command Single Key cryptosystem single key file single key lock single-keys single key storage single key stroke single keystroke command single-kick multivibrator single kill probability single knee brace single knife bale cutter single-knife hydraulic rubber cutting machine singleknife slitter singleknife slitting single knife switch single knit single-knit