A pulse tube refrigerator driven by a traveling wave thermoacoustic prime engine has no moving parts.
采用热声发动机驱动脉冲管制冷机，使彻底消除低温制冷机中的运动部件成为可能。
The downbeat data out of Germany, the largest economy in the euro zone, further stoked fears that the prime engine of the region's growth could be sliding toward recession, as well.
欧元区最大经济体德国公布的疲软数据进一步加剧了这样的担心：这个欧洲增长的主要助推器可能也将滑向衰退。
The downbeat data out of Germany, the largest economy in the euro zone, further stoked fears that the prime engine of the region's growth could be sliding toward recession, as well.
欧元区最大经济体德国公布的疲软数据进一步加剧了这样的担心：这个欧洲增长的主要助推器可能也将滑向衰退。
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