Hi Shaoguan,
glad you like them! I assume that the goal is to add the sentences to the SENTS tab under Dictionary. It may be possible to add all Chinese-French sentence pairs as example sentences in a user dictionary and have Pleco recognize them as such.
In a first step, I believe you would have to generate the user dictionary entries, linking one or more example sentences to each Chinese dictionary headword. However, I'm not sure what the internal tags are that are necessary for Pleco to add them to the example sentences database, or whether Pleco accepts them if they come from a user dictionary.
So for this, we'd clearly need help from
@mikelove. It may even be worth a thought for Pleco to cooperate with Tatoeba.org, harnessing their open source example sentence database with translations in all major Western languages, and including them in an upcoming major release for everyone.
Best, cheers,
Shun