| 1. | The angle of incidence equals the angle of reflection . 入射角等于反射角。 |
| 2. | The incidence of gallstones increases progressively with age . 胆石症的发病率随年龄而逐渐增高。 |
| 3. | Naturally, the expression for oblique incidence is more complicated . 倾斜入射的公式当然要更复杂些。 |
| 4. | 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。 |
| 5. | 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。 |
| 6. | This practice reduces the incidence of bare wood on trees of many cultivars . 这个措施对许多品种的植株说来,能减少光秃枝的出现。 |
| 7. | 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。 |
| 8. | 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。 |
| 9. | We use script letter to avoid confusion with the incidence and circ matrices . 为了避免与关联矩阵和广义圈矩阵混淆,我们利用了草体字母。 |
| 10. | The ratio of cross-links to branches may be varied by altering the incidence of chain transfer . 通过改变引入的链转剂就可以改变交联与支链的比例。 |