perennials

柯林斯词典

1. ADJ You use perennial to describe situations or states that keep occurring or that seem to exist all the time; used especially to describe problems or difficulties. 不断出现的; 长期存在的 (问题、困难)
...the perennial urban problems of drugs and homelessness. …城市长期存在的毒品和无家可归的问题。
2. ADJ A perennial plant lives for several years and has flowers each year. (植物) 多年生的
...a perennial herb with greenish-yellow flowers. …一种开黄绿色花的多年生草本植物。
3. N-COUNT Perennial is also a noun. 多年生植物
...a low-growing perennial. …一种长不高的多年生植物。