常見例句雙語例句Selenium is an essential mineral found in trace amounts throughout the body.硒是人和動物機體生長發(fā)育所必需的微量元素。Magnesium is an essential mineral for the human body, and is needed for relaxing muscles , bone formation and activating B vitamins.鎂是人體必需的一種礦物質(zhì)，主要用于放松肌肉，骨形成和激活B族維生素。Tobacco is an important economic crop, and nitrogen is essential mineral element. Studies on carbon and nitrogenous metabolism of tobacco have important action on tobacco production.煙草是中國一種重要的經(jīng)濟作物，而氮是植物必需的礦質(zhì)養(yǎng)分，研究煙草碳氮代謝規(guī)律，對指導(dǎo)煙草的生產(chǎn)具有重要的作用。 返回 essential mineral