XINING, June 18 (Xinhua) -- A new study has unveiled the key mechanism for alpine grassland carbon sink on the Qinghai-Tibet Plateau in western China, providing scientific underpinning for ecological ...

不积跬步无以至千里。英语的单词也不例外。跟着机农学英语，每天几个单词。积少成多，由量变到质变。符合哲学思想，合乎自然规律。是科学有效地学习方法。所以小伙伴们记得每天坚持哦！ 今天要和大家分享的词根是merg。 词根merg=dip,sink ...