399. Companies could also reduce prices for those who stayed to eat food on their premises, offer money-off vouchers (中巴金券) or other incentives for those who returned packaging and put more bins at strategic points in local streets, not just outside their premises.
公司还可以给那些在经营场所用餐的消费者减价，为那些送回包装的人提供代金券或其他鼓励，同时在街道的关键位置放置更多的垃圾箱，而不仅仅是在他们的营业场所外。

六级词汇讲解:
本句的主干是Companies could also reduce..., offer...and put...who stayed to eat food on their premises和who returned packaging均为定语从句，修饰各自前面的those。premises意为“场所，经营场址”。如：

Beverages sold in this restaurant can only be drunk on the premises.
此餐厅的饮料只供堂饮。

reduce prices表示“减价”，money-off意为“减价，打折”，off本身也可表示这个意思，这时，其前面可以加打折的百分比。如：
All shirts have 10% off.
衬衫一律九折。

bin意为“（垃圾）箱”，垃圾箱也可以说dustbin或rubbish can。