Beautiful butterflies hovered above the wild flowers...美丽的蝴蝶在野花上方飞舞。She hovered on the brink of death for three months as doctors battled to save her...3个月来她一直在死亡线上徘徊，而医生则在全力挽救她的生命。A hawk hovered in the blue sky.一只老鹰在蓝色的...
They can also become rolling loops or bipedal, walking robots.链型机器人也可以组装成环型的滚动机器人或两足步行机器人.The principle, research method and appraise criterion on Passive - Dynamic bipedal robot are introduced.介绍了被动动力式两足机器人的基本原理 、 究方法、价...
Their numerical system, derived from the Babylonians, was based on multiples of the number six.他们的数制源自古巴比伦人，以数字6的倍数为基数。The sexagesimal scale, or number system based on 60, was used by ancient Babylonians.古巴比伦人用六十进位制, 即以6...
The active ingredient in some of the mouthwashes was simply detergent.某些漱口剂中的有效成分只不过是洗涤剂而已。Commonly prescribed are anti - microbial mouthwashes containing the active ingredient chlorhexidine gluconate.抗菌抗菌漱口水都包含有效成分--太葡糖...
这些蜗牛体宽不超过1厘米。The snails are no larger than one centimetre across.出席的人不超过20名.There weren't beyond twenty people present.一种体积不超过10便士硬币大小的新机器能防止婴儿猝死。A new machine no bigger than a 10p piece could help save babies from ...