单词	自當時
释义	同EVER
随便看	double structure double-stub impedance matching double-stub tuner double subscript double substitution double substitution format double substitution method double substitution weighing double-substitution weighing mode double substitution weighing procedure double suction impeller double suction pump double-suction pump double-suction ventilator double sugar double summation double summer time double-summit double sunspot cycle double sunspot solar double superheterodyne double superphosphate double superphosphate（同 concentrated superphosphate） double supervision double surname