For reference
[经] 备案, 参考
🧩 词语组成解析
for
[fɚ]
prep. 为，为了;倾向于;关于;当作;
conj. 因为，由于;
🗣️ 情景例句
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。
I'd like to change this ticket to the first class.
我想把这张票换成头等车。
and maybe that is where the rub is.
问题的症结恐怕就在这里。