1. The radon concentration in this basement is extremely high, posing a health risk to anyone who spends a lot of time here.
这个地下室中的氡浓度非常高，对那些在这里长时间停留的人构成健康风险。

2. It is important to monitor radon levels in homes to ensure that they are within safe limits.
监测家庭中的氡水平非常重要，以确保其在安全范围内。