特定年龄出生率
age specific natality rate
青枯病发病率
Incidence of bacterial wilt disease
尘肺发病特点
prevalence characteristics of pneumoconiosis
初代无特定病原
primary SPF
primary specific pathogen-free
发病特点
pathogenetic characteristic
disease character
invasive feature
Morbidity feature
feature
clinical characteristic
characteristics of the disease
Incidence characteristic
characteristics of incidence
Attacking characteristics
Morbidity characteristic
epidemiological feature
Clinical characteristics
Onset feature
Disease characteristics
Onset characteristics
prevalence characteristic
Characteristic
disease onset