信箱: mailbox, post office box...
课堂: classroom...
青春期: puberty, adolescence...
硬件: hardware...
赞许: to praise, to laud...
问题: question, problem, issue, topic...
或是: or, either one or the other...
相机: camera (abbr. for ), at the opportune moment, as the circumstances allow...
争光: to win an honor, to strive to win a prize...
玻璃: glass, (slang) male homosexual...