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....
If ranching were made more intensive, crops could expand into empty pasture.如果放牧更加密集了, 农作物可以扩展到空的牧场上种植.They cleared large tracts of forest for farming, logging and ranching.他们清除了大片的森林以经营农耕、采伐与畜牧。His bunkhouse vacations a...
她撞到书桌上,受了瘀伤.She bruised herself against the desk.我的脸上全是瘀伤，肋骨还断了一根。My face was covered with bruises and I had a broken rib.他脚杆骨撞到椅子而受瘀伤.He bruised his shin knocking against the chair....
他们所谓的回答不过是表示承认的咕哝罢了。Their replies were no more than grunts of acknowledgement.滚滚浓烟盘旋翻腾，恶臭味呛得她喘不过气来。Dense smoke swirled and billowed, its rank fumes choking her.再小的细节都逃不过她的眼睛。No detail was too small to escape her attentio...