常見例句雙語例句The Fed's decision Wednesday to ratchet up the purchase of mortgage-backed securities underscores its willingness to keep spending.美聯(lián)儲周三決定加大收購觝押貸款支持証券，表明了該機搆繼續(xù)支出的意願。blog.sina.com.cn 返回 ratchet purchase