1. There is nothing we can do.

Carve a mark on the side of the moving ship to show where someone's sword fell ―― take measures regardless of the change of environment.

[Explanation] The metaphor is that you don't understand the development and changes of things, and you still look at the problem statically.

We can't be rigid in doing anything.

Follow the usual practice

[Explanation] Mo Shou: Mo Zhai was good at guarding the city during the Warring States period; Rules: ready-made or long-term rules and methods. Refers to conservative thinking, sticking to the rules and refusing to change.

We can't be rigid in doing anything.

act in an orderly way/manner

[explanation] follow: follow; Old-fashioned: stick to the old routine. Stick to the rules and lack innovative spirit.