perennial
[pəˈrɛniəl]
adj.
终年的，长久的;
多年生的;
不断生长的;
四季不断的;
n.
多年生植物;
长期存在的;
例句:
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A perennial is a plant that lives indefinitely.
多年生植物是指能存活很多年的植物。
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It mixes food crops with trees and perennial plants.
来自VOA
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the perennial problem of water shortage
缺水这个老问题
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I wonder at her perennial youthfulness.
我对她青春常驻感到惊讶.
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There is one last lesson, which is perennial.
来自THETIMES
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Its cost and coverage are perennial subjects of debate.
来自WSJ