Stoas lined marketplaces and sanctuaries and formed places of Business and public promenades.柱廊围绕在市场和神庙的四周,是交易和公众散步的场所.The city's riverfront is getting the biggest makeover, with parks, promenades and entertainment ...
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...