在不确定天气是否会变坏的情况下，我们决定稳妥起见，取消了露营计划。

Not sure about the weather changing, we decided to ___play it safe and canceled our camping trip.

投资新手最好谨慎行事，先投资一些低风险的项目。

New investors should ___play it safe by starting with low-risk projects first.