Their after-sales service was just so bad that I decided to never buy anything from that shop again.
他们的售后服务太差了,所以我决定从此不再能家商店买东西。
the necessary method of study is to group the relevant material and to take note of all possible variant forms and conditions.
应采取的研究方法是,把有关各方面的材料汇集起来,同时注意任何可能出现的异常情况和条件。