New words：

prevent [prɪˈvent] v.阻止；阻碍；阻挠

prevent sb/sth (from doing sth) 阻止；阻碍；阻挠

Sample Sentences：

Eating healthy food helps prevent illnesses.​
​​The fence prevents dogs from entering the garden.​
Snow has prevented communication with the outside world for three days.

communication [kəˌmjunɪˈkeɪʃ(ə)n] n.通信；交际；交流；信息

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