Nitrobacteraceae
硝化桿菌科
??? 情景例句
How has your visit to Shanghai been so far?
目前你對上海的印象如何？有何收獲？
Bad news has wings.
壞事傳千里。
It took years of hard work to speak good English.
講一口流利的英語需要多年的刻苦操練。