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by k2enemy 4620 days ago
It is explained in the article.

   But the Chinese government for various reasons
   wants to subsidize Chinese manufacturing. So they 
   want to send those dollars they accumulate back to 
   the United States.
China wants to send the dollars back to the US so that we can repeat the cycle. They could do it by buying US goods or stocks and the author explains why they don't. So the alternative is to buy treasuries.