frontal system
noun [ C ] environment specialized uk/ˈfrʌn.təl ˌsɪs.təm/ us/ˈfrʌn.t̬əl ˌsɪs.təm/
（由多个锋面组成的）锋系
a combination of weather conditions in which one or more weather fronts can be recognized
With so many frontal systems so close together, we can expect the weather to be highly changeable over the next few days. 有这么多锋系如此接近，我们预计以后几天的天气情况将会多变。