spreading，dissemination

例句：

1. 1.The news quickly spread throughout the town.
   这个消息很快在整个镇上传播开来。
2. 2. The seedsdiffused into the soil easily.
   种子很容易渗透到土壤中。
3. 3. Thedisease circulated throughthe community.
   这种疾病在社区中传播。