The river widens considerably as it begins to turn east.河流转向东流时河道大幅度变宽。She appeared to have changed considerably, which was only to be expected.她看起来变化很大，不过这完全是在意料之中的。Over the last few years tourism here has developed con...
中午前后雾散了，满天出现了蓬松的积云。Around midday, the fog lifted and puffy cumulus clouds appeared across the sky.躺在床上,可以望见碧蓝的天空中飘浮着大块团状的积云.From his bed he could see the great cumulus clouds that hung in the blue sky.当对流不太活跃时, 积云增长不太快.F...
Astronomers usually assume that interstellar dust is closely confined to the galactic plane.天文学家通常认为,恒星际星尘都是紧靠着银河平面的.Early astronomers thought that our planet was the centre of the universe.早期的天文学家认为我们的星球是宇宙的中心。Astronome...