The authority also conducts certification tests for operators of construction plants, and offers trade tests and intermediate trade tests for construction workers with a view to enhancing site safety and workmanship.是什么意思_The authority also conducts certification tests for operators of construction plants, and offers trade tests and intermediate trade tests for construction workers with a view to enhancing site safety and workmanship.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句