Hayley教口語，“口頭上的”用英語怎么說？

2020-12-22 09:40:54  每日學英語
by word of mouth

?

in speech but not in writing

口頭上的

All the orders were given by word of mouth so that no written evidence could be discovered later.

所有命令都是口頭傳達的，所以事后找不到任何書面證據(jù)。

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