Wèile / bǎozhèng / zhíwù / zhèngcháng / shēngzhǎng / tǔrǎng / bìxū / hányǒu / zúliàng / de / yǎngfèn

为了保证植物正常生长，土壤必须含有足量的养分。

To ensure normal plant growth, the soil must contain sufficient nutrients.