最重要的是，环境保护应该是我们的首要任务。

___The ___bottom ___line is that environmental protection should be our top priority.

最重要的是，需要立即采取行动应对气候变化。

___The ___bottom ___line is that immediate action is required to address climate change.

在任何谈判中，理解最重要的因素是成功的关键。

In any negotiation, understanding ___the ___bottom ___line is crucial for success.