But some economists stressed the risks that a more aggressive US policy poses.C. Fred Bergsten,director of the Institute for International Economists and a prominent member of the free-trade establishment , said he saw little evidence for a strategy ，except for"a willingness to listen to protectionist appeals" from the automobile，semi-conductor, steel and energy industries，among others , and a desire to mollify these industries ’powerful congressional protectors.
【正确答案】：但一些经济学家强调一个更富有挑战性的美国政策所带来的风险。C. 弗雷德·伯格斯坦是国际经济学家协会会长，也是自由贸易机构的杰出成员，他说，他认为一项策略只有“愿意倾听”来自于汽车行业、半导体行业、钢铁行业、能源行业及其他一些行业的“贸易保护主义申诉”,并且乐意去抚慰这些行业在国会中的强有力的保护者,才有依据。
