1 sentence

1. 我还是搞不明白藻类和氧气这档子事。

   wǒ hái​shi gǎo bù míng​bai zǎo​lèi hé yǎng​qì zhèi dàng​zi shì.

   I still can't figure out this algae and oxygen business.

   Source: OpenSubtitles