The boss will be back in about half an hour. (老闆大約在半個小時以內就會回來了。)

half an hour. (半個小時)

in about half an hour (大約在半個小時以內)

The boss will be back in about half an hour. (老闆大約在半個小時以內就會回來了。)

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資訊來源：

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Placeholder 湯偉晉編寫的英文字典

Placeholder 湯偉晉編寫的英文字典

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