black hat

基本解釋

He often interchanges his black hat with his grey hat.
他經(jīng)常將他的黑帽子與他的灰帽子交換著戴。
If your site is implicated in unethical (or black hat) SEO practices by the search engines, all of your pages might be removed from their indexes.
如果搜索引擎認爲您的站點採用了不道德的（即黑帽）SEO 做法，就可能會從它們的索引中刪除您的所有頁麪。
However, those early black hat SEO techniques were almost on the right path because keyword optimization is important in helping your site rank well in search engine queries.
但是，這些早期的黑帽 SEO 技術(shù)在大方曏上差不多是正確的，因爲關(guān)鍵詞優(yōu)化對於提高站點在搜索引擎結(jié)果中的排名很重要。

He places his tall black hat on his desk and opens a large window.
He is wearing a tall black hat and a long coat.
Her hands shook as she pinned on her hat and covered herself with her black veil.

April came and went, and the flaw remains unpatched as of the start of Black Hat.
FORBES: Internet Explorer Remains Vulnerable To Autofill Flaw, Says Researcher

someone in a particular situation who is acting for morally bad reasons, or something that shows who this person is