When the pull line is pulled or loosened, the reel can rotate positively and reversely, which drives the screen curtain to roll up or fall down.
拉动或松开拉线，卷筒可正、反向转动，带动纱帘卷起或落下。
Rock burst normally refers to the craze of the terrane with crepitation when the rock slices or rock pieces shoot off along with a certain direction or fall down.
岩爆一般是指在隧道开挖后，发生的一种带有爆裂声响的岩层开裂，岩片或岩块沿一定方向弹射出或坠落下来。
Rock burst normally refers to the craze of the terrane with crepitation when the rock slices or rock pieces shoot off along with a certain direction or fall down.
岩爆一般是指在隧道开挖后，发生的一种带有爆裂声响的岩层开裂，岩片或岩块沿一定方向弹射出或坠落下来。
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