Ten or twenty years ago, you could buy milk in returnable, refillable, glass bottles, and many people recycled voluntarily.

十年或者二十年以前，你能可以买玻璃瓶子可归还，可重新灌装的牛奶，而且很多人都自愿循环利用。

Ten or twenty years ago, you could buy milk in returnable, refillable, glass bottles, and many people recycled voluntarily.

十或二十年前，你可能会买可回收、可重复充填的玻璃瓶装的牛奶，很多人会自觉回收利用。

10 or 20 years ago, you could buy milk in returnable, refillable glass bottles, and many people recycled voluntarily.

10年或20年前，你可以用可回收、可再填充的玻璃瓶购买牛奶，许多人自愿回收。