However, the compressed air pass the same large area of Laval nozzle in the traditional vacuum ejector all through the working process, so its large shortcoming is high compressed air consumption.
但是，目前传统的射流式真空发生器在工作过程中始终以同一较大的气流流通面积供给压缩空气，存在着空气消耗量大的缺点。
However, the compressed air pass the same large area of Laval nozzle in the traditional vacuum ejector all through the working process, so its large shortcoming is high compressed air consumption.
但是，目前传统的射流式真空发生器在工作过程中始终以同一较大的气流流通面积供给压缩空气，存在着空气消耗量大的缺点。
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