日期：
来源：雅诚德英语网
It takes 40 liters (20.5 gallons) of sap to make one liter (two pints) of syrup.
40升（20.5加仑）树液才能熬制出1升（2品脱）糖浆。
It takes 40 liters (20.5 gallons) of sap to make one liter (two pints) of syrup.
40升（20.5加仑）树液才能熬制出1升（2品脱）糖浆。