gruff
adj
(of a person, his voice or behaviour) rough; surly (指人、 其声音或行为)粗野的, 粗暴的
Beneath his gruff exterior he's really very kind-hearted. 他外表粗鲁, 心地却十分善良.
Another good reason for taking a part-time job is that employers usually prefer to hire someone who has already had some work experience. They value someone who leads an active life and is anxious to learn. For example, a newspaper might employ you if you