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 ...
Many policies pay out only after a period of weeks or months.很多保单在几周或几个月后才得以赔付。You pay regular premiums and in return the insurance company will pay out a lump sum.你定期支付保险费，而保险公司则会一次性给你一笔钱作为回报。Having to pay out unexpecte...
Instruments developed at the hospital allow doctors to thread microscopic telescopes into the digestive tract.医院开发研制的仪器使医生们得以将显微内镜伸入消化道。Microscopic examination of a cell's chromo-somes can reveal the sex of the fetu...