Methods: Distal tibia osteotomy lengthening and epiphysis distraction lengthening operation.

方法：胫骨远端骨骺牵伸延长术、胫骨下端截骨延长术。

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For the first half of 2012, that rate was 2.65%, down from 2.90%, a reflection of the steep decline in yields over the intervening year, given that the central bank was also conducting Operation Twist a portfolio-lengthening effort that saw the Fed sell holdings in the shorter end of the curve and buy an equal amount of longer-run Treasuries to keep long-term interest rates down.

FORBES: Federal Reserve Delivers $46B Of First-Half Profit To U.S. Treasury