1·It is proved by the results that the performances of ejectors can be dramatically improved by properly selecting the geometrical and operation parameters of gas-solid ejectors.
结果证明：正确选择气固喷射器的几何参数和操作参数，就能大大改善它的性能。
2·Graham major products are the ejectors, liquid ring vacuum pumps, condensers, heat exchangers, and complete vacuum systems used every day by people throughout the world.
格雷汉姆的主要产品是真空喷射器、液环泵、冷凝器等以及整套真空系统， 在全球多个工业领域有着广泛的应用。