Gervaise and Terry had opened their crisp packets and were munching greedily.热尔韦斯和特里已经打开了薯片包装袋,嘎巴嘎巴地大嚼起来。I learned how to weigh out packages of seed.我学会了如何按重量把种子装袋。The supermarket offers a bag-packing service, as a convenience to customers.为方便顾客,这家超级市场提供装袋服务。