We've converted from oil to gas central heating.
我們已經(jīng)把中央供熱系統(tǒng)由燃油改成了燃?xì)狻?/p>
He crossed the street and walked alongside Central Park.
他過(guò)了馬路，然后在中央公園旁邊走著。
The traffic lights are controlled by a central computer.
交通信號(hào)燈由中心計(jì)算機(jī)控制。