Research learning is a good kind of study method, breaking an original teaching system, at 21 centuries.
研究性学习的这些优点对改进初中实验教学中的不足是很有帮助的。
At the beginning of 21 centuries, another kind of new-style plane is copy turns type autogiro, it can perpendicular rise and fall and level fly.
21世纪初，另一种新型飞机是仿转式旋翼飞机，它能够垂直起落和水平飞行。
Have exceeded into for 21 centuries' today at mankind, "information ages", "knowledge-based economy" such word the most much to the point language in ages in now in description in people.
在人类已经迈入二十一世纪的今天，“信息时代”、“知识经济”这样的名词成了人们描绘当今时代的最为贴切的语言。
Have exceeded into for 21 centuries' today at mankind, "information ages", "knowledge-based economy" such word the most much to the point language in ages in now in description in people.
在人类已经迈入二十一世纪的今天，“信息时代”、“知识经济”这样的名词成了人们描绘当今时代的最为贴切的语言。
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