形容词
中文翻译：空洞的
同义词：
['empty', 'void', 'hollow', 'insubstantial例句：1. The room was vacuous of life as soon as the lights went out.（当灯光熄灭时，房间变得空荡荡的，毫无生气。）']
例句：
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1. The room was vacuous of life as soon as the lights went out.
当灯光熄灭时，房间变得空荡荡的，毫无生气。
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2. The vacuous promises were never fulfilled.
那些空洞的承诺从未实现。
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3. The vacuous conversation ended with a sigh.
这场空洞的对话以叹息告终。