vacuum bell jar

例句：

1. 1. The vacuum bell jar is used to store and preserve food.
   真空罐用于储存和保存食物。
2. 2. The vacuum bell jar was designed to keep the contents fresh for a long time.
   真空罐设计用来长时间保持内容物的新鲜。
3. 3. The vacuum bell jar was used in the kitchen to make sauces and soups.
   真空罐在厨房中被用来制作酱汁和汤。