1. threaten ['θret(ə)n] 
v. 威胁，恐吓 threat n.
They threatened to kill him unless he did as they asked. 他们威胁说如果不按他们说的做就要杀了他。

2. endanger [ɪn'deɪn(d)ʒə] 
vt. 危及，使遭到危险
He would never do anything to endanger the lives of his children. 他永远不会做出任何危及孩子生命的事情。
endangered species 濒危物种

3. crisis ['kraɪsɪs] 
n. 危机
economic crisis 经济危机

4. risk [rɪsk] 
v./ n. 冒险 ，风险
The skipper was not willing to risk taking his ship through the straits until he could see where he was going. 这位船长不愿意冒险在看不见方向之前将船开过海峡。
at risk 处于危险中

5. stake [steɪk] 
n. 棍子，火刑，赌注
at stake 处于危险中，危如累卵

6. hazard ['hæzəd] 
n. 危险，冒险 hazardous adj. 有危险的 
moral hazard 道德风险 
fire hazard 火灾隐患

7. venture ['ventʃə] 
vt. 敢于 vi. 冒险，投机 n. 企业，风险
He wanted to venture into the mountainous wilderness of the countryside. 他想冒险进入农村的荒野山区。
venture capital 风险投资

8. adventure [əd'ventʃə] 
n. 冒险 
adventure activities冒险活动