虽然作者认为拯救物种的代价太高，但我向你保证，这项崇高的事业是无价的。

While the author thinks that the price of saving species is too high, I assure you that this noble cause is priceless.

youdao

但我向你保证我会对你很好的。

But I am assuring you to be kind with you.

youdao

你可能会遇到完美先生，但我向你保证，他会是个假完美先生。

You may meet Mr Wonderful, but I assure you he will be Mr. Phoney Wonderful.

youdao