1. 用作动词时，为及物动词，表示“冒……的危险”“使遭受危险”。如：
They risk their lives in order that we may live more safely. 他们冒了生死危险使我们生活得更安全。
后接动词作宾语时，要用动名词，不能用不定式。如：
They risked losing everything. 他们冒失去一切的危险。
A lot of people run the risk of being killed. 许多人冒着被杀害的危险。
They knew they risked being arrested.
他们知道自己冒着被捕的危险。
Pregnant women who are heavy drinkers risk damaging the unborn foetus.
孕妇酗酒可能会危及腹中胎儿。
The captain was not willing to risk taking his ship through the straits in such bad weather.
船长不愿意在这样恶劣的天气里冒险将船驶过海峡。
《柯林斯高阶英汉双解学习词典》
2. 用作名词时，注意以下用法：
(1) 要表示冒危险，通常与动词run, take等搭配。如：run the risk (of sth/ of doing sth)
run risks
冒…的危险；冒险（做某事）
to be or put yourself in a situation in which sth bad could happen to you
We don't want to run the risk of losing their business.
我们不想冒险失去他们的生意。
Investment is all about running risks.
投资就是要冒风险。
I knew I was running a great many risks.
我知道我正担着很多的风险。
Why run the risk? 为什么要冒这种危险?
There was so much to lose (that) we couldn’t take any risks. 损失这么多，我们不能冒任何风险了。
run a risk (of sth/of doing sth)
冒风险；有…的危险
to be in a situation in which sth bad could happen to you
People who are overweight run a risk of a heart attack or stroke.
超重的人有犯心脏病和中风的危险。
That's a risk I'm not prepared to take.
我不愿意去冒这个险。
You have no right to take risks with other people's lives.
你没有权利拿别人的生命去冒险。
(2) 表示“……的危险”，其后通常不接不定式，而接 of doing sth。如：
He dare not run [take] the risk of being caught by the police. 他不敢冒被警察抓住的危险。
~ (to sth)
危险人物；会带来风险的事物
The group was considered to be a risk to national security.
这伙人被认为是威胁国家安全的危险分子。
There’s not much risk of losing money if you bet on that horse. 如果你押那匹马，输钱的风险不太大。
There is a small risk of brain damage from the procedure
该手术有导致脑损伤的轻微风险。
The officers had run the risk of being dismissed
这些警官冒了被开除的风险。
《柯林斯高阶英汉双解学习词典》
比较run [take] the risk of doing sth与run [take] a risk in doing sth：前者指冒做某事的危险或风险，其中的of doing sth为修饰the risk的定语；后者指做某事有危险或冒风险，其中的in doing sth是状语，in有类似when的含义。如：
I took a risk in telling him the news at that moment. 我那时把消息告诉他，那是冒了风险的。
You're taking a big risk showing this to Kravis
你把这个给克拉维斯看会有很大的风险。《柯林斯高阶英汉双解学习词典》
(3) 注意以下习语的用法：
①at risk 处境危险，在危险中
How much at risk is the smoker? 吸烟者的危险性有多大?
Smoking places you at serious risk of cardiovascular and respiratory disease.
吸烟会大大增加罹患心血管和呼吸道疾病的风险。
《柯林斯高阶英汉双解学习词典》
If they have the virus they are putting patients at risk.
如果他们有这种病毒，就会将病人置于危险境地。
②at one’s own risk 对发生的事负责，自担风险
Persons swimming beyond this point do so at their own risk. 游泳者超越此界限若有意外后果自负。
Those who wish to come here will do so at their own risk.
那些想来这里的人风险自负。
③at the risk of 冒……的危险
He saved my life at the risk of losing his own. 他冒着生命危险救了我的性命。
An estimated seven million people are at risk of starvation
估计有700万人面临着饿死的危险。
最后这个例子小编也感觉到疑惑，拿出来供大家研究：
She risked her own life to help a disabled woman
她冒着生命危险去帮助一个残疾妇女。
《柯林斯高阶英汉双解学习词典》
