Bluegrass is really bright green but looks bluish from a distance.青草是亮绿色的,但从远处看带点蓝色.She listened to traditional mountain music called bluegrass.她经常听一种叫做“蓝草”的传统山村音乐.He s also the host of a bluegrass radio show and is also...
Cepheid variable stars are stars whose brightness changes at regular periods.造父变星是一种光线按规律周期发生变化的恒星.His first great discovery was made when he recognized a Cepheid variable star.他的首次重大发现产生于他认识了一颗造父变星的时候....
She may not have the money to maintain or restore her property...她可能没有足够的钱来维护或修葺她的房产。When John began to restore the house in the 1960s, nothing had been touched for 40 years.约翰 20 世纪 60 年代开始整修那幢房子时，它已有 40 年都无人照管了。Advance...