But trekking into the wilderness, even for seasoned explorers, can be risky business.

VOA: standard.2009.12.10

He anticipated this power much as his father, a reasonably well-to-do banker, might have anticipated long-term earnings from a particularly risky business venture.

他预测到他的力量，正如他的父亲，一个相当富有的银行家，能够预测到从一笔风险高的生意中,能获得多少长期利益一样。

耶鲁公开课 - 弥尔顿课程节选

Still, developing drugs is a risky business, so it's best to remain low key.

FORBES: Modesty ablaze

He added that farming was "a risky business" and prices went up and down.

BBC: Farmers hold protest over money received for products

Indeed, the very act of writing history in many Arab countries can be risky business.

NPR: Historian Robert Satloff