One potential problem is that opening the mouth to breathe detracts from the streamlining of these fishes and tends to slow them down.
一个潜在的问题是，张嘴呼吸会减损这些鱼类的流线型，可能使它们的速度减慢。
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The key question for the US Federal Reserve is whether the interest rate medicine it has administered is sufficient to slow the economy to the lower estimates of potential growth.