底线是,人们吸烟会使健康面临风险。
___The ___bottom ___line is that people's health is at risk if they smoke.
底线是,今天的成年人必须停下来想一想他们在做什么。
___The ___bottom ___line is that the adults of today have to stop for a second and think about what they are doing.
底线是,我们需要减少碳排放以应对气候变化。
___The ___bottom ___line is that we need to reduce carbon emissions to combat climate change.