TAIPEI: The U.S. dollar strengthened against the Taiwan dollar on Tuesday, gaining NT$0.007 to close at NT$31.968. Trading activity on the Taipei forex market saw significant turnover, with the total reaching US$1.186 billion during the session.According to Focus Taiwan, the greenback began the day at NT$31.970. Throughout the trading session, it fluctuated within a range, reaching a low of NT$31.908 and a high of NT$32.044 before settling at its closing rate.