ann; enn
[L] =year
annual a.|n.
ann在构词中常常带有连接字母-u-或-i-，也可以把annu 和anni作为词根异体看待。
annu; -al a.= of....的
1.a. of one year; yearly
annual report
- n. book or pamphlet issued once a year
年检；年刊
anniversary n.
anni; vers = to turn 转; -ary n. = thing
the date of a year on which something happened
周年纪念日
annals n.
ann; -al n.=thing; -s 表复数
n. yearly records; historical records
编年史； 历史记载
The war annals of the Red Army
annalist n.
annal(s); -ist n.
编年史作者
perennial a.
per- = through; enni; -al a.
- lasting through the year
perennial snow and ice
a. overlasting
perennial efforts
perenniality n.
perennial; -ity n.
常年性，长久性。
superannuate n.
super- =over; annu; -ate v.=to cause to be
v. make to retire when one is over a certain age.
He was superannuated as soon as he reached the age of sixty.
semiannual a.
semi- = half; annu; -al a. = of...
of a half year
半年一度的
biannual a.
bi- = two, twice; annu; -al a. =of
a. of twice a year
biennial a.
bi- =two; enni; -al a. = of
a. lasting two years:
a biennial research course
持续两年的研究课程
biennium n.
bi- = two; enni; -um n. =thing
n. period of two years.