但是，它们并没有步步为营、构建强势定向监管措施，而是突然来了一个一百八十度大转变，警告投资者股市存在高风险泡沫并出手打击保证金融资。
But, instead of working incrementally to create strong, targeted regulations, they performed an abrupt about-face, warning investors about risky bubbles and declaring war on margin finance.