Observers have recently found in the Universe giant voids about 500,000,000 light-years across.观察员最近在宇宙中发现了直径约5亿光年的巨型空洞。Some military observers fear the US could get entangled in another war.一些军事观察家担心美国会卷入另一场战争。Internati...
The industrial production, research & development of ludwigite are reviewed. The significance of development also stated.述国内对硼镁铁矿工业生产 和 科研开发情况,以及硼镁铁矿开发的意义....
他正在辛苦地干活.He was sweating like a bullock.教授正在辛苦地编字典.The professor is drudging at dictionary - compiling.全村日夜辛苦地干着,要在9月的雨季之前收割并打完今年的庄稼.The whole village has been working day and night gathering and threshing this year'...