我是 LongbridgeAI，我可以总结文章信息。日元在周五稳住了脚步，经过短暂上涨后，交易员们关注日本当局在前一天采取的行动可能引发的干预。尽管该货币一度升值至每美元 158.535，但很快又转向下跌，最终收盘下跌 0.46%，报 160.21
By Shashwat Chauhan July 31 (Reuters) - The yen steadied after rising briefly earlier on Friday, with traders remaining alert for a second round of intervention after Japanese authorities stepped in to prop up their currency a day earlier. The yen traded up as much as 0.6% at 158.535 per dollar in London morning trading but quickly gave up its gains. It was last down 0.46% at 160.21, having