$bear->material->uploadArticle($articles);
$bear->material->uploadArticleImage(string $path);
$bear->material->uploadImage(string $path);
$bear->material->uploadVoice(string $path);
$bear->material->get(string $mediaID);
$bear->material->delete(string $mediaID);
$bear->material->updateMaterial(string $mediaID, $article, int $index = 0);
$bear->material->stats();
$bear->material->list(string $type, int $offset = 0, int $count = 20);