Urine is sterile.尿液是无菌的。Calcium is excreted in the urine and stools.钙通过尿液和粪便排出体外。These wastes are finally eliminated from the body in the urine.这些废物最后从尿中排出....
蜂鸟发现花蜜和花粉是很有营养的.Hummingbirds have discovered that nectar and pollen are very nutritious.为什么蜂鸟和大猩猩都有脊骨?Why do hummingbirds and gorillas both have backbones?小蜂鸟栖在山楂树枝上.The hummingbird perches on a twig of the hawthorn....
It is a Cinderella of charities, and needs more help.这个慈善机构得到的关注太少了，需要更多的帮助。The royals have always been patrons of charities pulling in large donations.王室成员一向热心慈善事业，捐资数目巨大。I wrote hundreds of begging letters to charities...
The subway was covered in graffiti.过街地道里涂满了乱七八糟的图画和文字。There's no vandalism, no graffiti, no rubbish left lying about.没有损害公共财物的行为，也没有涂鸦和随处丢弃的垃圾。The maintenance programme will additionally seek to keep the sites free ...