incidence
noun
ˈɪnsɪədəns
noun
1
the
number
of
times
something
happens,
especially
crime,
disease
etc
[正式] 〔尤指罪行、疾病等的〕发生率;
[+
of
]
Why
did
the
incidence
of
heroin
use
continue
to
climb?
为什么吸食海洛因的人数继续攀升？
high/low
etc
incidence
Smokers
had
the
highest
incidence
of
colds.
吸烟者患感冒的比率最高。