The temperature variation in a refrigeration appli-ance with envelop structure depends on the characteris-tics of the entire envelop, which may consist of a lot of plane walls.

• 它一整句的意思是在一整个密封的冷藏装置中的温度变动取决于这一整个冷藏装置的特别构造；这些构造有可能由许多平板构成.