YSK: If you're job hunting, despite the widespread myth that cover letters don't matter and are ignored - companies absolutely do read them and some will bin your application if you haven't at least gone to the effort of submitting one.
from /r/YouShouldKnow
YSK：如果你在找工作，儘管普遍認爲求職信並不重要，而且會被忽視，但公司絕對會閱讀求職信，如果你至少沒有努力提交求職信，有些公司會放棄你的申請。