这个数列是一个等比数列，公比是2。
MyCidian is a free, web-based Chinese-English dictionary.
I wanted one place with everything I needed to learn Chinese — definitions, pronunciation, stroke order, examples — instead of juggling tabs across half a dozen sites, each good at one thing. No such place existed, so I built it.
It's free and staying that way. Web only, with no app planned. Ad-free for now; if that ever changes, signing in will remove them.
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