I want to conclude with problems, which may sound kind of negative but this is—I don't shrink from negativism.

我想以问题来结束，这听起来可能有点否定意味，但这是——我不会逃避否定。

Conclude with a quote or call to action.

以一个引证结束，或者号召大家去行动。

I will conclude with a last example.

我最后再举一个例子。

I want to conclude with a poem by Owen.

我想以一首欧文的诗作结。

Let me conclude with a final piece of advice.

最后，我想发出一项忠告。