因为系统上存在其他并发运行的程序，所以此任务变得更加复杂。

This task is made more complex by the presence of other programs running concurrently on the system.

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还存在其他执行(exec)某个进程的系统调用，它们的区别在于接受参数的方式和是否需要传递环境变量。

There are other system calls to exec a process, and they differ by how they accept parameters and if environment variables need to be passed.

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不过在其他行星系统中，地球大小或者稍大一些的卫星是完全可能存在的，美国宾州大学伊利校区(Penn State Erie)的天文学家戴伦·威廉斯(Darren Williams)说。

But in other planetary systems, moons Earth-size or larger are not out of the question, says astronomer Darren Williams of Penn State Erie.

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