externally heated oven

例句：

1. 1. This oven is designed to be externally heated, which makes it easy to use.
   这个烤箱设计为外部加热，使用起来很方便。
2. 2. The chef uses an externally heated oven to bake the cakes.
   厨师用一个外部加热的烤箱来烤蛋糕。
3. 3. Externally heated ovens are more energy-efficient than traditional ones.
   外部加热的烤箱比传统烤箱更节能。