其优势体现为：跨越时空的界限、数据收集与处理的便捷、避免研究者效应和容易实现可重复性的验证研究等。
Its advantages embody: the overcome of space-time boundary, convenience of data analysis, avoidance of researcher effect and easy to repeated test.
这种教学方式打破了传统教学的时空界限，可以让人们体验到自由获取知识的乐趣。
This teaching method has break down the traditional limitation of time and space, which can make people enjoy acquiring knowledge freely.
教师劳动的目的和劳动对象决定了其劳动的范围极其广泛，而且没有严格的时空界限。
It's the purposes and the objects of the teachers' work to decide the extensive range and no strict time space limitation.
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