1. US Treasury Secretary Janet Yellen said that it is not necessary to maintain high interest rates. This means that the Federal Reserve may consider starting to cut interest rates in the second half of this year to cope with the weakening of inflationary pressure.

2. Yellen believes that economic growth is facing certain challenges and high interest rates may make economic growth more difficult. This shows her concern about the negative impact of high interest rates on economic growth.

3. However, Yellen also stressed that inflation is still high and reducing inflation remains the top priority. This means that the Federal Reserve is unlikely to significantly cut interest rates this year.

4. Market analysts generally expect that the Fed may raise interest rates by 0.5 percentage points at its July-August meeting and may reduce them by 0.25 percentage points in September-November. Yellen's comments provide some support for this market expectation.

5. Overall, Yellen's comments indicate that the Fed may take a more moderate stance on interest rate adjustments in the future. However, inflation control remains a priority and interest rates will not be significantly lowered in the short term. This is a relatively balanced signal for the financial market.