It's a valuable teaching tool.

这是一个很有价值的教育工具。

The video has become an invaluable teaching tool.

录像已经成为非常有用的教学手段。

The video has become an invaluable teaching tool .

录像已经成为非常有用的教学手段。

Even computer technology can become an important teaching tool.

电脑科技也将是辅助我们教学的重要工具。

That makes them a good teaching tool to explain how real science works.

这种错误往往会变成一个很好的教学工具，来解释真正的科学是如何运作的。