| 1. | The incidence of gallstones increases progressively with age .
胆石症的发病率随年龄而逐渐增高。 |
| 2. | The incidence of this disease has dropped considerably in the past few years .
近几年这种病的发病率大大降低了。 |
| 3. | The disease is infrequent, and this makes it impossible to determine its true incidence .
本病较为罕见，故无法确定其发病率。 |
| 4. | Hypertension has been reported with widely varying incidence in embryonal nephroma .
据报导，高血压伴有胚胎性肾瘤的发病率变动极大。 |
| 5. | Commonly a sporadic disease, actinobacillosis occasionally occurs in high incidence .
该病通常是一种散发性疾病，但偶尔也有高的发病率。 |
| 6. | The correlation between skin cancer incidence and exposure to ultraviolet radiation is given in fig. 11-22 .
图11-22中给出皮肤癌发病率与暴露紫外线辐射之间的关系。 |
| 7. | The morbidity and mortality of the host species is usually proportional to the number of cocidial cocysts ingested .
宿主的发病率和死亡率与吃进球虫卵囊的数目，通常是成正比的。 |
| 8. | The fall in incidence of whooping cough in the very young is directly related to widespread immunization with suitability .
幼儿百日咳发病率的下降，是与广泛使用一种适宜的免疫法直接有关。 |
| 9. | Continued exposure to sunlight of people whose skin is not strongly pigmented is related to an increased incidence of skin cancer .
皮肤色浅的人种，如果持续的暴露在太阳光线时，皮肤癌的发病率要增加。 |
| 10. | There may be an association between ambient co levels and the incidence of myocardial infarction or sudden death, or the case-fatality percentages .
环境中一氧化碳含量与心肌梗塞发病率，或猝死率、或与致死病例百分比之间也许存在某种关系。 |
