短语讲解：

1. Researchers say concern about the elections in the United States is increasingly affecting the American economy.

concern about 使（自己）关心…
例句：She showed great concern about you.
她很为你担心。

2. Economists note consumer spending is responsible for more than two thirds of economic activity nationwide.

be responsible for 为…负责，形成…的原因
例句：You'll be responsible for anything wrong.
出了事唯你是问。
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