Valve Disadvantages: the valve is prone to leakage around the stem, especially in-board leakage when a vacuum is pulled on the valve outlet.
阀门的缺点：当阀门排气口处是真空时，阀门在阀杆附近容易泄漏，特别是内部泄漏。
Those words are echoed in the National Science Board report - Preparing the Next Generation of STEM Innovators: Identifying and Developing Our Nation's Human Capital.
国家科技委员会的报告-《储备下一代STEM开拓者：发现和培养人才》中完整引述了这段话。
Those words are echoed in the National Science Board report - Preparing the Next Generation of STEM Innovators: Identifying and Developing Our Nation's Human Capital.
国家科技委员会的报告-《储备下一代STEM开拓者：发现和培养人才》中完整引述了这段话。
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