New words：

risk [risk]
n.风险；危险；危险人物；会带来风险的事物
v.使…冒风险（或面临危险）；冒…的风险（或危险）；冒险做

Sample Sentences：

He risked his life to save her.
He saved my life at the risk of losing his own.
It was a difficult decision but we decided to risk it .
The disease is spreading, and all children under 5 are at risk.

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