常見例句雙語例句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。 他說長期在外航行,飲食的維生素C含量要高,要有營養(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因子。 返回 three essential nutrients