"美元贬值" can be translated into English as "the depreciation of the U.S. dollar" or "the decline in the value of the U.S. dollar".
Both expressions are commonly used in financial and economic contexts to describe a decrease in the value of the U.S. dollar relative to other currencies.
"Depreciation" specifically refers to the reduction in the value of an asset or currency over time.
"Decline in the value" is a more straightforward way of saying that the worth or purchasing power of the dollar has decreased.