So why, if China was still running a decent current-account surplus and a long-term capital surplus, did the RMB suddenly depreciate, forcing the PBoC to intervene (though not very vigorously) to prevent it from falling further?
那么，既然中国仍然存在漂亮的经常项目顺差和长期资本盈余，为什么人民币会突然贬值，迫使人民银行出手干预（尽管力度不是很大）以防止其进一步下跌呢？