You hold on to them so there won't be a problem later.
你来保管, 免得等一下又出问题了。
Have you ever thought about becoming a professional musician?
你曾经考虑了成为一个职业的音乐家吗?
The worst thing about the do-it-yourself game is that sometimes even men live under the delusion that they can do anything, even when they have repeatedly been proved wrong.