nǐ / zhàn / zài / zhè / lǐ / huì / dǎng / hèngr / dà / jiā / dōu / kàn / bú / jiàn / hēi / bǎn

你站在这里会挡横儿，大家都看不见黑板。

You are blocking the way here, and everyone cannot see the blackboard.