现在有多少人参与外汇交易？英文怎么表达？

                      现在全球参与外汇交易的人数众多，具体数字难以精确统计。可以用英文表达为 "How many people are currently involved in foreign exchange trading?" 或者更具体的 "What is the estimated number of participants in the global foreign exchange market?" 这样的提问可以帮助了解市场活跃度。