She had a kind of vacant look on her face.

她脸上有种茫然的神情。

辞典例句

She has a vacant look on her face.

她的脸上是一片茫然的神色.

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From her vacant look we can know that she probably is in bad condition.

从她发呆的样子我们可以知道她也许身体不好.

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She stared ahead with a vacant look, trying to grasp the important moment.

她带着迷茫的神情凝视着前方, 努力要抓住这重要的时刻.

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