For inspiration, watch the coaches prepare for daily tourist performances, in which they snap iron bars with their heads and break glass by throwing a pin at it.
观看教练准备日常教程的表演也是一种激励，他们会用头撞断铁棒，并投掷大头针击破玻璃。
2
To make crushed ice, put some ice cubes into a strong polythene bag, seal it tightly, then hit it with a rolling pin to break up the ice.