I didn't do well in this exam. It's not too late to find out the reason and learn the lesson.

There was a man crossing a river in Chu, and his sword fell from the boat into the water.

In study, we can't wait for him.

To comprehensively analyze the problem, you can't sit in the well and watch the sky, like a frog in the well.

You can't learn by rote or pretend to understand, so that you can make progress.