The second knife of the excavator is always driven out by the construction site.

Does the subject want to ask "the reason why the excavator's second knife is always driven out of the construction site" is not standardized. If the excavator always leaves the construction site, it may be because the operation is not standardized and unskilled, which leads to the inability to work efficiently and safely on the construction site, thus causing the dissatisfaction of the site management personnel. It is recommended to have professional training before operating the excavator. You should be familiar with the operation manual and safety specifications of the excavator to ensure that you can operate the excavator safely and efficiently.