Calcium reacts with water.钙和水会发生化学反应。A dog reacts to kindness by wagging its tail.狗摇尾巴以报答人们的爱护.The eye reacts to the light.眼睛会对光作出反应....

Cataracts is a condition that affects the transparency of the lenses.白内障是一种影响晶状体透明性的疾病。The rotor cataracts water over the top of the machines.回转轮将水从机器顶上注入.In one study, light smokers were found to be more than twice as l...

Cataracts is a condition that affects the transparency of the lenses.白内障是一种影响晶状体透明性的疾病。In one study, light smokers were found to be more than twice as likely to get cataracts as non-smokers.研究表明，即使抽烟不多的人也比不抽烟的人患白内障的概率高出一...

When a large object impacts the Earth, it makes a crater.当巨大物体撞击地球时，就会产生凹坑。The helmets are designed to withstand impacts equivalent to a fall from a bicycle.头盔设计的承受力相当于从自行车上摔下的冲击力。There is also a new steering wheel with ...