Areas covered include numeration, number systems, geometry, measurement, and the use of addition and subtraction in word problems.
其中应用题中含盖的范围有：计算方法、系统学、几何学、测量和使用加法和减法。
Some areas covered include developing an understanding of simple, open, and closed circuits and learning how different mechanical systems work.
一些简单的开、闭合电路，可以让孩子们掌握机械系统的工作原理。
Some key content areas covered by these plug-ins include.
这些插件包含的一些关键的区域包括。
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