Do you know the mainning of 'the birds and the bees'?该如何处理

Do you know the mainning of 'the birds and the bees'?
Yes, you're not wrong! It's 'the birds and the bees'.

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just tell me now
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Teachers or parents shall tell teenagers about the birds and the bees at proper time, and give correct guidance to young people as to sexual matters

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I don't know...