多年生的英文：
perennation

It's a perennial.
这是多年生草本植物。

Perennial ryegrass throws a lot of autumn growth
多年生黑麦草在秋季长势很好。

A perennial North American herb(Oxypolis rigidior)having pinnately compound leaves and umbels of small white flowers.
毒牛芹一种生长于北美洲的多年生草本植物(毒牛芹)，生有羽状的复叶，开伞状小白花

Bouncing Bet:a perennial Eurasian herb (Saponaria officinalis) having dense clusters of pink to whitish flowers.
肥皂草:一种多年生的欧亚草本植物(肥皂草肥皂草属),花簇稠密,颜色介于粉红至白色之间。

It's a low-growing perennial.
它是多年生矮小植物。

Potassium manuring may be less critical in continuous grass farming than in ley farming
在多年生牧草地施用钾肥的迫切性比短期草地要小些。

Switchgrass is a perennial native grass that grows quickly.
柳枝稷是一种生长快速的多年生本地草种。

Some grasses last only a year. Others are perennial.
有些草只生长一年。而有些则是多年生的。

The persistent,mostly underground base of a perennial herb.
宿根多年生草本植物的通常位于地底下的宿存基部

This flower is Eurasian perennial pink having fragrant lilac or rose flowers with deeply fringed margins.
这种花是紫丁香色或玫瑰红色的一种带有毛边的欧亚多年生石竹。