double-walled bell jar

例句：

1. 1.The double-walled bell jar is used to store liquids and prevent them from leaking.
   双层壁钟罩用于储存液体，防止它们泄漏。
2. 2. In the lab, scientists use double-walled bell jars to control the temperature of the samples.
   在实验室里，科学家们使用双层壁钟罩来控制样品的温度。
3. 3. The double-walled bell jar was designed to protect fragile objects from damage during transportation.
   双层壁钟罩被设计用来在运输过程中保护易碎物品免受损害。