PARIS Washington and Beijing's agreement to temporarily reduce tit-for-tat tariffs marks an improvement for trade, but levels remain high and are likely to weigh on economic growth, said a senior Federal Reserve official. The comments by Fed governor Adriana Kugler, at a symposium in Ireland, came shortly after the United States and China said they would sharply lower tariffs on each other's goods for 90 days while negotiations continued. "Obviously that's an improvement as far as trade between