该地区的许多老房子仍然没有中央供暖系统。

Many old houses in the region still lack ___central ___heating.

新公寓配有中央供暖和空调。

The new apartment comes with ___central ___heating and air conditioning.

在冬季，中央供暖系统让整个办公室保持温暖舒适。

During the winter months, the ___central ___heating keeps the entire office warm and comfortable.