n.加热-冷却
Steel is tempered by heating and then cooling it. 钢是通过先加热后冷却来回火的。
Heat sometimes causes a prickly rash on the skin. 热有时使皮肤上生剌痛的疹子。
This is a highly efficient new heating system. 这是个高效的新取暖系统。
Shall I turn the cooling (heating) down? 要我把冷（暖）气调弱一点吗?
Gases expand on heating and contract on cooling. 气体加热时膨胀,冷却。
The system works on the principle that heat rises. 该项装置是按照热力上升的原理运转的。
