一声尖叫打破了这可怕的沉寂。The unearthly silence was broken by a shrill screaming.直升机的嗡嗡声打破了沉寂。The silence was broken by the whirring of a helicopter.接着又是一阵短暂的沉寂。Again there was a short silence....
制造商正在研制价格更便宜的新一代数字收音机。Manufacturers are working on a new generation of cheaper digital radios.有3种新产品是以传统的草药为基础研制的。Three of the new products are based on traditional herbal medicines.盼望有一天有人会研制出一种能有效预防疟疾的疫苗。Roll on the da...
Shoppers picked their way through puddles caused by persistent rain.购物的人们小心翼翼地择路避开由于连续下雨形成的水坑。Persistent damage or inadequate healing may lead to chronic lameness.反复受伤或治疗不当可导致长期跛足。His persistent attempts to complain to h...