vacuum environment的用法和樣例：
例句
- Because of the oilless self-lubrication characteristic in ceramic, the bearing may overcome lubrication problems in an ultra-high vacuum environment.
因陶瓷材料獨具的無油自潤滑特性，故在超高真空環境中，可克服普通軸承無法實現潤滑的難題。 - The vacuum pump is used to provide a vacuum environment for the freezing-drying cabinet and the condensers so as to enable the moisture in the materials to sublimate in the vacuum.
真空泵的作用是給凍干箱和冷凝器提供一個真空環境，使物料的水份可以在真空下進行升華。
