亚洲国产精品视频中文字幕,毛片亚洲AV无码精品国产午夜,亚洲国产精品色婷婷,国产综合日韩精品第16页

單詞乎

nitrogen cycle

nitrogen cycle是什么意思、nitrogen cycle怎么讀

nitrogen cycle漢語翻譯

【醫(yī)】 氮循環(huán)

nitrogen cycle英語解釋

名詞 nitrogen cycle:

  1. the circulation of nitrogen; nitrates from the soil are absorbed by plants which are eaten by animals that die and decay returning the nitrogen back to the soil
0
糾錯