Alien(或者exotic) dangerous invasive species.
He is not the one who can protect himself well, thus he is suspectible to be hurted.外来危险入侵物种
He is not the one who can protect himself very well, he is easy hurted.dangerous introduced species
He's not that kind of person who knows how to protect himself, so he always got hurt easily.外来危险入侵物种：exotic invasive species with great dangerous
句子：He is not the kind of person who could protect himself well but the one who could easily be hurt.