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billet-doux

美 [ˌbɪleɪ ˈdu]英 [ˌbɪleɪ ˈduː]

复数：billets-doux

billet-doux

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A timely billet-doux can patch up a lovers' quarrel .

Perhaps she just looked first into the bouquet to see whether there was a billet- doux hidden among the flowers;