Horsehead Nebula: New stars have already formed inside part of it.马头星云: 新的?星已经在其内部形成了.Many stars are invisible without a telescope.许多星辰不用望远镜便看不见。Two backup singers that want to be lead vocalists, solo stars?两位和声歌手渴望成为主唱成...
Typical of the grassland dwellers of the continent is Amarican antelope, or pronghorn.美洲羚羊或麋鹿是这个大陆上典型的草原居民.Typical of the grassland dwellers of the continent is the American antelope, or pronghorn.美洲羚羊, 或称叉角羚,是该大陆典型的草原动物...
It never rusts or tarnishes...它从不生锈，也不会失去光泽。It never rusts or tarnishes.它从不生锈，也不会失去光泽。This metal tarnishes easily.这种金属易变色.Brass tarnishes quickly in wet weather.天气潮湿时黄铜很快会失去光泽....
The leading player is ill. Let his understudy to appear on the scene.主角演员病了, 让他的替角出场.The understudy was substituted when the leading actor fell ill.主角演员患病,由替角代替演出.The understudy is substituted when the leading actor fall...