| 1. | Cavities in teeth are caused by decay .
牙齿上的空洞是由龋蚀造成的。 |
| 2. | Cavitation can be caused by a variety of reasons .
气穴可以由各种原因引起。 |
| 3. | Famine can be caused by variety of factors .
饥荒可能是由于各种各样的因素造成的。 |
| 4. | Obstruction may be caused by chronic cicatrization .
梗阻也许是由慢性瘢痕造成的。 |
| 5. | Inflation is caused by excessive money stock .
通货膨胀是由于货币积累过剩造成的。 |
| 6. | The bending of the light rays is caused by refraction .
光线的弯曲是由折射造成的。 |
| 7. | Hardness is caused by divalent metallic cations .
硬度是由一些两价金属阳离子引起的。 |
| 8. | Boils are caused by infection .
因为感染才生疖子。 |
| 9. | 50 percent of all accidents are caused by drunk drivers .
50的事故是由酗酒者所引起的。 |
| 10. | Many pest situations are caused by natural phenomena .
许多害虫的情况都是由自然现象造成的。 |
