We can’t read these signs at night.

我们在夜间不能辨认出这些标识。

What I want to say is about these two topics: the protection of the environment and the importance of action.

我将就以下两个话题进行发言：环境保护和行动的重要性。

We’ll discuss these in detail below.

我们将在下面详细讨论这些。