单词	oxygen-18
释义	oxygen-18 =heavy oxygen
随便看	time-invariance property time invariance system time invariant time-invariant timeinvariant boundary time-invariant channel time invariant channel time-invariant linear filter time-invariant model time invariant operation time-invariant operation time-invariant regulator time-invariant system time invariant system time invariant variables time invarying system time inversion time inversion invariance Time is drawing on. Time is money. time-is-money Time is money time is of the essence time isolation Time is on my side bmlr bmlz bmmj bmmm bmnf bmny bmqj bmqs bmrg bmrs 暖メル暖冬暖国暖地暖帯暖房暖気暖流暖炉暖簾