However, refining class models with textual constraints is a time-consuming and error-prone task.
然而，用文本约束细化类模型是耗费时间并且易于出错的任务。
Do they perform the task only occasionally and do their time constraints make that transition annoying?
是否他们只是偶尔执行这项任务，以及他们的时间限制要求使这样的渐变变得烦人？
There are two constraints need to addressed in battery-powered real-time systems, one is the deadline of the task in real-time systems and the other is energy issue.
在电池供电的实时系统中，需要考虑到两个约束：一个是实时系统中任务的截至时间，另一个就是能量问题。
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