keep a straight face idiom
C2 板着脸，不露笑容
to manage to stop yourself from smiling or laughing
She tried to keep a straight face but, unable to contain herself, burst into laughter. 她努力要板起脸来，可是没有忍住，爆发出了一阵大笑。
| 单词 | keep a straight face |
| 释义 | keep a straight face idiom C2 板着脸，不露笑容 to manage to stop yourself from smiling or laughing She tried to keep a straight face but, unable to contain herself, burst into laughter. 她努力要板起脸来，可是没有忍住，爆发出了一阵大笑。 |
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