engage in speculation

• 从事投机,做投机生意

engage in speculation的用法和样例：

例句

1. He ventured his fortune in a speculation.
   他拿他的大宗财产做投机生意。
2. It was by his advice that my father risked most of his property in the speculation that ruined him.
   我父亲正是听了他的劝告方把大部分财产拿去冒险做投机生意，结果破了产。