Women who give birth may be biologically "older" than women who don't, a new study suggests.一项新研究发现，生过孩子的女性在生理上会比那些没有生过的更老”。For th...
The oak is one of the finest and most useful of all our forest trees.在所有森林树种之中, 橡树是最为优良、最为有用的一种树木。Its height sometimes exceeds sixty feet, while the g...
Elephants are large mammals of the family Elephantidae and the order Proboscidea. Traditionally, two species are recognized, the African elephant and ...
Snakes are elongated, legless, carnivorous reptiles that can be distinguished from legless lizards by their lack of eyelids and external ears. Many sp...
研究人员认为，他们已揭开了狗狗鼻子周围的秘密，解释了为什么狗狗们的鼻子如此冰凉。Researchers believe they have solved one of science's greatest mysteries. They think they have found out w...
假如你买了一些塑料制品，上面标明可生物降解”。那你就可以放心了，因为你知道将它扔掉后它会无害降解。嗯，不要太快下结论。当我们从适合垃圾填埋场的特性这一角度考虑生物降解能力时，会发现它并不是理想的材料属性。原因是，我们在设计生物降解能力时，通常会追求快速的生物降解，然而垃圾填埋场尚未开始收...
每个孩子都喜欢喝鲜牛奶。那香浓的味道，甜美的滋味是多么诱人！对于这样一种极为有用的饮品，你肯定想要了解更多吧? 我们喝的牛奶几乎全部来自奶牛的乳房。不过，人们还饮用其他动物的奶，例如羊、驴以及骆驼。Every child likes to drink new milk. How pleasant i...
We use this every day as a stand-in for love and the human heart, but it doesn't really look like the real thing.我们每天都用这个符号代表爱以及人类的心脏，但这符号和真正心脏的模样...
The earth-worm is also called the dew-worm, because it likes to come out of its hole and creep about when the grass is wet with dew. It is a very long...
袋鼠在澳大利亚很常见的动物。它们有强有力的后腿，大大的脚更适合跳跃，还有一条长长的尾巴保持平衡，以及一个比较小的头。Kangaroos are endemic to the country of Australia. They have large, powerful hind legs, larg...