blind off的用法和样例：
例句
- The drift to the mine was blocked off.
矿井的水平巷道被堵塞了。 - It is also clogged with sebum and sloughed off dead skin cells, but the lack of exposure to the air does not lead to the oxidation ofmelanin, so the clogged matter stays white.
也是被皮脂腺和脱落的皮肤死皮细胞堵塞，但是因为它不接触空气，黑色素并没有被氧化，所以堵塞的那一头始终是白色的。
