The preferred method would be a high-pressure retention test using an inert gas and/or an outboard helium leak test using a helium mix as a purge source.是什么意思_The preferred method would be a high-pressure retention test using an inert gas and/or an outboard helium leak test using a helium mix as a purge source.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句