essential mineral

基本解釋

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(jì)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。