Please accept this little gift as a souvenir.

请接受这个小礼物作为纪念品。

youdao

Please accept this gift in appreciation of all you've done for us.

承蒙鼎力相助，不胜感激，谨备薄礼，敬请笑纳。

《牛津词典》

Please accept this tip.

请收下这小费。

youdao

Please accept our apologies for any inconvenience caused by this workaround and bear with us while we resolve the issue.

BBC: Your guide to the BBC Embedded Media Player