在这种情况下，当无法联系主要服务器，或者它由于某种问题而关闭时，secldapclntd后台程序将自动切换到辅助服务器。

In the situation, when the primary server cannot be contacted or if it goes down due to some problem, secldapclntd daemon automatically switches to the secondary server.

youdao

MacRuby 0.6发布之后，用户发现了一个问题，在运行某代码段的时候， 从后台线程切换到主线程会导致程序崩溃。

One issue that was found after the release of MacRuby 0.6 seems to cause problems with scheduling a block to run on the main thread from a background thread.

youdao

这就意味着当你的后台进程实际弹出一个用户界面时，用户可能已经切换到系统的例外部份并执行其他工作，如打电话等。

This means that when your background process actually fires up that UI, the user could be way over in another part of the system, doing something else - such as taking a phone call.

youdao