北斗

nà wǎn zì ran lǎo shī zài cāo chǎng shàng gěi wǒ jiào shòu zěn yàng biàn bié běi dǒu xīng

那晚，自然老师在操场上给我教授怎样辨别北斗星。

That night, nature teacher taught me how to identify the Ursa Major on the playground.