它是为中学生准备的。
例如，“Alien Contact”是为中学生开发的一种练习，他们可以使用手持设备来确定自己的位置。
"Alien Contact," for example, is an exercise developed for middle-school students who use hand-held devices that can determine their location.
费尔法克斯县的所有公立学校已经开始为他们的初高中学生使用在线课程材料。
All the Fairfax County public schools have begun using online course material for their middle- and high-school students.
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