The so-called "little help" means that a car has both an electric-powered motor drive and a gasoline engine at the same time. These could be used independently or cooperatively depending upon the situation.
所謂的「複合動力車」，也就是一部車同時具備電動馬達及汽油引擎兩組動力系統，它們可視場合、同時或分別使用。