它们可以接受指示去执行不同的任务，并很好地完成。
They can be instructed to carry different tasks and finish them well.
即使是最早的部落也有一种计算系统，哪怕不先进，也足以完成他们必须执行的任务。
Even the earliest of tribes had a system of numeration that, if not advanced, was sufficient for the tasks that they had to perform.
在这种策略下，调用者要等待执行完成之后才能继续后续的任务。
Here the caller waits for the execution to complete before proceeding to the next task.
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