In the system, the data acquisition task was done by a lower level computer, and only when the value of a signal was "obviously changed", data transfer was proceeded.
由此构成的下位机数据采集系统，只有当采集信号有明显变化时，才将相关数据向上位机传送。
Secondly, four variables about second language acquisition are especially enunciated, namely, input, process, task and context.
其次，作者讨论了二语习得的四个差异：输入，过程，任务及情境。
Laboratory studies of category acquisition limit to categorization task. So category theory on the basis of classification study can not applied to other nonclassification types of category learning.
实验室有关范畴学习的研究只局限于对分类的研究上，这就导致在分类研究基础上提出的范畴理论不能适用于其他非分类范畴学习任务。
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