directly-heated

例句：

1. 1. The oven isdesigned to heat the food directly.
   烤箱设计用来直接加热食物。
2. 2. The microwave can beused to directly heat food.
   微波炉可以用来直接加热食物。
3. 3. The hot air from the heateris directed directly to the floor.
   加热器产生的热空气直接吹向地板。