When carbon is added to iron in the proper proportions , the result is steel.
A、containerD
暂无解析
How many people are aware that a dancer with the New York City Ballet typically wears out a minimum of two hundred pairs of toe shoes per year?
Thefearofsmallpox,whichterrorizedtheeighteenthcentury,hasnoanalogy(likeness)today.
Insectpestsareamongtheleadingcausesofcropfailure.
The flower bud of a water lily 百合 opens at sunset since .its opening is triggered(commence) .by the decreased light.
Blue－green algae grow abundantly in salt marshes.
