每晚把所有玩具放到原位也不是什么难题,尤其如果你的小孩能帮你的话(就当是一个游戏,而不是无聊的家务)。
Getting all the toys in place at the end of the day is also not a big problem especially if your little one will help you (make it a game instead of a boring chore).
但是,购买这种水族缸的人也会面临一个难题:该如何做好清理工作?
However, people who buy the tanks and will face a dilemma: how to do a good clean-up work?
这实在是一个难题,并且我敢说你们中的一些人也为其所困。
It is a very difficult question and I daresay that some of you have been troubled by it.
This is a really interesting system because it also solves a problem for the cell.
这真的是一个有意思的系统,因为它也解决了细胞面对的难题
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