Sure, the USD is the world's reserve currency. And, while it's also the currency of the international trade, the US's share of China's import isn't as significant -- in 2019, China imported over $2T, or $2,000B, worth of goods and services globally and, of that, only $163B, came from the US. In fact, the US is not even the biggest import nation, it's South Korea, followed by Japan and Taiwan.