The philosopher speculated about the future of the human race.那位哲学家考虑过人类的前途.He speculated that he would succeed.他推测他将成功.Would he be what he is if he hadn't speculated on the stock of exchange?如果不搞证券投机买卖,他会成为今天这个样子 吗...
The size of the nebula at this stage is inversely proportional to its mass.这个阶段星云的大小与其质量成反比。A powerful telescope can resolve a nebula into stars.一架高性能的望远镜能从星云中分辨出星球来.A nebula is really a discrete mass of innumerous stars...