从该星系中心收到的无线电信号证实了黑洞理论。Radio signals received from the galaxy's centre back up the black hole theory.他们发现了以往想象不到的新客体 —— 脉冲星 、 类星体和黑洞.They have discovered now , previou sly unimagined objects - pulsars, quasars, and b...
It's very difficult being a woman in motor racing.做一名女赛车手很不容易。Do they realize we are racing towards complete economic collapse?他们意识到我们的经济马上要彻底崩溃了吗？Mr Honda was himself a keen racing driver in his younger days.本田先生自己...
Coughs and sneezes spread infections much faster in a warm atmos-phere.在温暖的环境中，咳嗽和喷嚏传播疾病的速度要快得多。Coughs and sneezes spread infections.咳嗽和打喷嚏会传播传染病。Sneezes are not the olny way of catching a cold.打喷嚏并不是得了感冒的唯一症状....
Relative pronouns and adverbs introduce attributive clauses.关系代词和关系副词引导定语从句." I " , " you " and " he " are all personal pronouns.I, you和 he 都是人称代词.Words such as " he ", " it ", " who ", and " anything " are pronouns." he...