什么是“左”错误？

1. I hope you will particularly study our "Left" errors.
   要特别注意我们“左”的错误。
   
2. We should criticize wrong ideologies whether they are "Left" or Right.
   要批判“左”的错误思想，也要批判右的错误思想。
   
3. However, this kind of mistake was usually preceded by a "Left" error of underestimating the enemy.
   然而这种错误，往往有一种“左”倾轻敌的错误为之先行。
   
4. This resolution dealt with errors in political line, especially the errors of Wang Ming's "Left" opportunist line.
   这个决议讲了路线的错误，特别是王明的“左”倾机会主义路线错误。
   
5. Only when we have become well grounded in both will we really be able to correct our mistakes, both "Left" and Right.
   只有打下根底，才能真正纠正错误，包括纠正“左”的和右的错误。

说的太官方了 打架都不懂 举个例子

王明 博古 李德第五次反围剿失败就是个例子