Obviously, when the weather cooperates, and when Mother Nature gives us sap to pull, and that's when the temperature's above freezing during the day and below freezing at night, that's when the sap runs.

约翰：显然， 当天气配合时， 当大自然母亲给我们提供树液时，白天温度高于冰点， 晚上低于冰点时， 树液就会流动。