lemon juice is a kind of flavoring in America, used in making biscuits, and can be purchased in a supermarket. Lemanade is a drink made from lemon juice, sugar and water, which is commonly provided for customers in a cafe and restaurant as a drink.
lemon juice 是做香料的，通常用来做饼干等等，而lemonade才是当作饮料喝的柠檬汁。所以以后在咖啡馆或者餐厅，可别错点了lemon juice 来喝啊：）
