Today, the graves act as a stark reminder of the past and a useful warning to future generations.

今天这些墓园作为对过去历史的提醒令人触目惊心，对后人起着警示的作用。

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"We will respond to the threat of climate change, knowing that the failure to do so would betray our children and future generations, " he said, warning of a "long and sometimes difficult" path to sustainable energy sources in a nation dominated by its fossil fuel industries such as oil and coal.

CNN: Obama's speech ties current issues to founding principles