我们的飞机摇摇晃晃地飞过巴拿马中部地区。We had a bumpy flight over the centre of Panama.该方案主要的受益者是北部和中部地区的人们。The scheme mostly benefits people in the North and Midlands.我们随后朝西前往波兰中部。We then headed west towards the heartland of Poland....
Life on Earth will become unsustainable unless population growth is held in check...人口增长要是不加控制的话，地球上的生命将无法持续发展。The story in Estonia and Lithuania is similar — and looks equally unsustainable.爱沙尼亚和立陶宛情形也与之相似,都不能持续下去.Life ...
Advances in ethane dehydrogenation to ethene have been reviewed.乙烷脱氢制乙烯是乙烷利用的有效途径.Results show that PCE was dechlorinated reductively to DCEs and TCE, probable VC and ethene.结果表明:在微生物的作用下PCE还原脱氯为TCE和DCEs, 可能有VC和乙烯....