devoid of content ; having nothing substantial ; vague and general
因为现在里面空空洞洞，充满空气。
For now they're bare and full of air.
youdao
现在是空空洞洞，冷冷清清，分明已经无人居。
It was now empty, forlorn, and apparently abandoned.
为什么一定要写得那么长，又那么空空洞洞的呢？
Why must they write such long and empty articles?
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