We don't need to pass in the-string to recurse because it is already in the parent environment and does not change from call to call.

我们不必将the - string传递给recurse，因为它已经在父环境(parent environment)中，而且从一个调用到另一个调用时不会改变。

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Thus, environment variables are used only if a variable is not set in any makefile or on the command line. Note: parent makefile variables are sometimes, but not always, passed down.

因此，一个变量只有在没有在任何makefile或命令行中指定时，才会使用环境变量的设置注意：父进程makefile变量有时候会传递下来，但不总会这样。

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In a Network Deployment environment, the "parent" server emits certain notifications on behalf of the "child" server.

在Net work Deployment环境下，“父”服务器会代表“子”服务器发出某些通知。

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In her new incubator, the baby would sit on a heated mattress that would then fold around it creating a closed, sealed environment when held by the parent.

BBC: Baby in an incubator

The parent of America's fourth-largest wireless operator, T-Mobile USA, cited "the extremely competitive environment in Germany and the recent foreign exchange rates development" as reasons for altering its outlook.

FORBES: Deutsche Telekom Dives On Profit Warning