When the client's DNS cache is empty (for both the browser and the operating system), the number of DNS lookups is equal to the number of unique hostnames in the web page.

空 （用于浏览器和操作系统） 客户端的 DNS 缓存时 DNS 查找的数目是等于在网页上的唯一的主机名的数目。

youdao

Each operating system makes its own unique demands on available memory resources.

每个操作系统都有自己对可用内存资源的独特需求。

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Even when it actually hit shelves months later, it still elicited excitement because of its unique design and brand new operating system.

事实上尽管它出现在展架上晚了几个月，但它的出现依然令人兴奋，因为它拥有独特的设计和完全崭新的操作系统。

youdao

Extensive tests on the plane's engine revealed the crack was a result of the "unique operating environment" of the test flight, and was not a widespread issue, he added.

BBC: Grounded US F-35 fighter jet fleet to resume flights

The four healthcare REITs all offer unique operating platforms and the common thread is that they all should capitalize on the attractive tailwinds of low interest rates and the new certainty of the Affordable Care Act.

FORBES: Health Care REITs Should Provide Durable Income in 2013

Operating in a fairly unique niche compounds the sense of isolation.

FORBES: Keeping My Eye On The Ball