If a vehicle pulls away, it starts moving.

There was a roar and a cloud of smoke as the car pulled away from the traffic lights. 那辆车马达轰鸣，喷出一股浓烟，从红绿灯处开走了。

If you pull away from someone who is holding you, you suddenly move your body backwards, away from them.

She pulled away just as he was about to kiss her. 他正要吻她时她避开了。