Swallows migrate south in winter.燕子在冬天迁徙到南方。The swallows are building a nest under the roof of our house.燕子正在我们的屋檐下筑巢.Swallows come by groups at the advent of spring.春天来临时燕子成群飞来....
They can be irritatingly indecisive at times.他们有时优柔寡断得令人气恼。I could not hold my calmness any more and shouted at him irritatingly.我再也无法平静,眼睛喷了火,逼视着他....