"这样做更危险" 的英文表达可以是 "This is more dangerous" 或者 "Doing it this way is more dangerous."

这个表达的来源是英文的常见表达方式，它的意思是指做某事的方式或者做某事的选择会带来更多的危险。

下面是一些英文例句及其中文翻译：

Example 1:

Engpsh: "It's more dangerous to drive at night. The roads are harder to see and there are fewer people around to help if something goes wrong."
Chinese: "夜间开车更危险。路面更难看清，如果出了问题周围也没有人可以帮忙。"

Example 2:

Engpsh: "I wouldn't recommend hiking alone. It's more dangerous if you don't have someone with you to help if something happens."
Chinese: "我不建议独自徒步旅行。如果没有人陪伴，出事故时更危险。"

Example 3:

Engpsh: "It's more dangerous to swim in the ocean than in a pool. There are more hazards in the ocean, pke strong currents and unpredictable waves."
Chinese: "在海里游泳比在游泳池游泳更危险。海里有更多的危险因素，比如强流和不可预测的浪。"