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| 1. | Colluvial deposits at the foot of valley slopes usually affect only narrow strips of valley bottom. |
| 河谷坡脚处的崩积体通常只影响到谷底较窄的地带。 |
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| 2. | affect suddenly, usually adversely. |
| 突然侵袭通常是反对的。 |
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| 3. | STDs usually affect the reproductive system and urinary system But can be spread to the mouth or rectum |
| 通常侵犯生殖器官、生殖系统和泌尿系统,但通过口交或肛交也可能扩散到口腔或直肠;疾病后期也可侵犯其它器官和系统。 |
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