Relationships between elements are described using either family or tree metaphors. 元素之間的關(guān)系使用族或樹(shù)環(huán)境說(shuō)明。
The program suggests the planting of things like native grass or trees to reduce the loss of soil from crop lands. 計劃建議種植類(lèi)似于本土草或樹(shù)的植物以減少種植土地的流失。