Tired old trucks were struggling up the road below us, belching black smoke.破旧的卡车冒着黑烟艰难地沿着我们下方的公路往上爬。The truck was belching black smoke.那辆卡车正在冒黑烟。The car ahead was belching out black smoke.前面的小汽车冒着黑烟。Billows of smoke were belching from the chimney.巨浪似的烟正从烟囱里喷出来。