Sung knew that apples grow best in an area that maintains a temperature of seven degrees Celsius or lower for at least 1,000 hours, pears for at least 800 hours, and peaches, 600 hours.
宋慶雲卻不，他還想種果樹﹘ ﹘那可是他最拿手的。經過一個冬天，宋慶雲每天觀察天候，記錄氣溫、雨量，並作好統計，他相信當地可種溫帶果樹。