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 specific pathogen-free
primary SPF
发病特点
Attacking characteristics
disease character
Onset characteristics
Morbidity feature
Disease characteristics
Onset feature
characteristics of the disease
Incidence characteristic
characteristics of incidence
Morbidity characteristic
disease onset
feature
Characteristic
epidemiological feature
Clinical characteristics
clinical characteristic
invasive feature
prevalence characteristic
pathogenetic characteristic