Slipcases
(slipcase 的复数) n. 书套
🗣️ 情景例句
You've been a very helpful.
你帮了大忙。
No man can be a good ruler unless he has first been ruled.
没受过他人的统治，就不能很好地统治他人。
When I asked him what he was doing, he smiled guiltily and then put the parcel on the desk.
当我问他正干什么时，他内疚地笑了，然后把那个大包拿到了桌上。