常見例句雙語例句What is the use of these same negative ion generators?這些所謂負(fù)離子發(fā)生器有什么用呢?。The new method in the determination of negative ion surface-active agent is introduced, comparing with methylene blue method, it have merits of simple operation step and little dosage.介紹了水中陰離子表面活性劑測定新方法，該法與亞甲藍(lán)法比較，具有操作步驟簡單，萃取劑用量少的優(yōu)點。Let's purify air with a negative ion generator.我們用負(fù)離子發(fā)生器凈化一下空氣吧。原聲例句I have shown that by taking Avogadro's number of individual ion pairs and putting them all together in a line, the system's energy became more negative.我推導(dǎo)出了,從每一個離子對中抽出阿伏加德羅常數(shù),再把它們放在一起在一列中，這個系統(tǒng)的能量就變得更負(fù)。麻省理工公開課 - 固態(tài)化學(xué)導(dǎo)論課程節(jié)選 返回 negative ion