And America's middle class is facing a very uncertain future.
美国的中产阶级的前景也不明朗。
Many algae make oil, which they store as a foodstuff against an uncertain future.
许多藻类会生成油，作为食物储存以备不时之需。
Thirty years ago, China also faced an uncertain future.
30年前，中国还面临着一个不确定的未来。
Thirty years ago, China also faced an uncertain future.
30年前，中国还面临着一个不确定的未来。
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