求翻译：Fears that the US and other major economies are slowing sharply sent investors piling into the safety of government debt on Tuesday, sending UK, German and US bond yields down to record lows. Global equities and commodities such as oil that move on expectations of growth prospects, also fell sharply. Investors sent the Japanese yen to a 15-year high against the dollar as investors exited risky currency trades. Analysts say the moves reflected expectations that in order to stimulate global growth, central banks have to buy more government bonds and are in no position to tighten monetary policy until 2012 at the earliest. “There is a global perception that while we are not necessarily going into a Japan-type scenario, there is a recognition of a slow recovery accompanied by disinflation that means there is little pressure on central banks to raise rates,” said Gerald Lucas at Deutsche Bank. The slide in bond yields will focus attention more than usual on Ben Bernanke, the Federal Reserve chairman, when he gives a policy speech at the central bank是什么意思？

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