The rural workforce has been flowing in to the cities ever since the open door policy was adopted.
自从改革开放政策实施以来,农付劳动力正不断流向城市。
Next Von Frisch thought that bees needed to know more than just the distance to a faraway place.
接着,冯·弗里施认为蜜蜂不仅需要知道到远的喂食点的距离。