形容词regularsteadyperpetualconstantcontinuous

形容词annual

1. 多年生：按照草的生长期限又分为多年生(Perennial)和一年生(Annual)以及两年生等. 另外,在冬季以及对于棚养的奶牛和小牛,大麦、干草、青贮发酵饲料(silage)、麸皮(cash crop waste)、乳清(whey,制作奶赂的副产品)等也是饲料.

2. 常年性：临床上一般分为常年性(perennial)尽信书不如无书但临床表现与上述两型变应性鼻炎相似,称血管运动性鼻炎或称神经反射性鼻炎,刺激可来自体外(物理、化学方面),或来自体内(内分泌、精神方面),故有人看作即是变应性鼻炎,

3. 永久的：peremptory 绝对,强制的 | perennial 永久的 | perfect 无缺点,全然的; 改进,完成

4. perennial是什么意思

4. 长期的：turnaround转变 | perennial长期的 | lavish浪费的,滥用的

1. （尤指问题或困难）永恒的，持续的，亘古不变的
    You use perennial to describe situations or states that keep occurring or which seem to exist all the time; used especially to describe problems or difficulties.

    e.g. ...the perennial urban problems of drugs and homelessness...
           毒品和无家可归这两个一直困扰城市的问题
    e.g. There''s a perennial shortage of teachers with science qualifications.
           有理科教学资格的老师一直都很短缺。

2. （植物）多年生的
    A perennial plant lives for several years and has flowers each year.

    e.g. ...a perennial herb with greenish-yellow flowers.
           开绿黄色花的多年生香草

1. (botany) a plant lasting for three seasons or more

1. recurring again and again

    e.g. perennial efforts to stipulate the requirements

    Synonym: recurrentrepeated

2. lasting three seasons or more

    e.g. the common buttercup is a popular perennial plant

3. lasting an indefinitely long time
    suggesting self-renewal

    e.g. perennial happiness