Other options to restore the frescoes would have required using chemicals to remove the unwanted layer or using physicalmeans to scrape it off.
其他修复壁画的方法可能需要使用化学物质来去除不需要的层，或者使用物理方法将其刮掉。
2
In the process of formation, the material must have received an environmental signal that reflects a change in climate and that can be deciphered by modern physical or chemical means.
在形成的过程中，材料必须接收到环境信号，反映气候变化，并能被现代物理或化学手段破译。
3
Another option is to swap physicalmeans of controlling technology with voice recognition systems, which are already used in some devices, or pure intuition.