three essential nutrients

基本解釋

PO Bailey, who dishes up three meals a day, said it is essential to provide a diet high in vitamin C and nutrients when away for long periods.
士官柏利負(fù)責(zé)潛艇上的一日三餐。他說(shuō)長(zhǎng)期在外航行，飲食的維生素C含量要高，要有營(yíng)養(yǎng)很關(guān)鍵。
Nitrogen is one of the three essential nutrients in the terrestrial ecosystem and is regarded as a main limited factor in the forest ecosystem.
氮是陸地生態(tài)系統(tǒng)中三大營(yíng)養(yǎng)元素之一，在森林生態(tài)系統(tǒng)中被視作主要的限制生長(zhǎng)因子。