If you have long operations to perform, you should make sure to do them in extra threads (background or worker threads).

如果有耗时的操作，你应该把这些操作放在另外的线程中进行处理(后台线程或者工作线程)。

youdao

Specifically, if everything is happening in the UI thread, performing long operations such as network access or database queries will block the whole UI.

如果UI线程需要处理每一件事情，那些耗时很长的操作——诸如访问网络或查询数据库等——将会阻塞整个UI(线程)。

youdao

Specifically, if everything is happening in a single thread, performing long operations such as network access or database queries on the UI thread will block the whole user interface.

特别是，如果把所有的事件都放在主线程中来处理，需要长时间来处理的事件比如网络访问或者数据库查询，会阻塞整个UI。

youdao

The sheer size of the service is at the heart of many complaints, such as long waiting times, canceled operations and poor nursing care.

VOA: standard.2009.09.24

So I have n operations log n times, n log n there we go, n log n. Took us a long time to get there, but it's a nice algorithm to have.

所以我log，n遍的n次操作，就得到了,虽然花了不少时间得到了这个结论。

麻省理工公开课 - 计算机科学及编程导论课程节选

Eikenberry and McChrystal stressed the long-term nature of the U.S.commitment to the people of Afghanistan, long after the transition of combat operations from coalition to Afghan forces begins in 2011.

VOA: standard.2009.12.09

That said, if an agent is working undercover, the time spent away from family depends on how long undercover operations go.

FORBES: What Is It Like To Be An Agent Of The U.S. Secret Service?

Experience also suggests the need for the U.S. military to be prepared to conduct two major long-term operations at a time.

CENTERFORSECURITYPOLICY: Center for Security Policy | The Measure of a Superpower: A Two Major Regional Contingency Military for the 21st Century

The Senate panel's report focuses on Apple units in Cork, Ireland, where Apple has long based its operations for Europe, the Middle East, India, Africa, Asia and the Pacific.

WSJ: Apple Pays No Tax on Much of Its Overseas Income, Senate Panel Finds