今天我买单。

Jīntiān wǒ mǎidān.

Today I will pay.

因为在中国，如果你和你喜欢的女孩子一起吃饭，那么你最好买单。

Yīnwèi zài Zhōngguó, rúguǒ nǐ hé nǐ xǐhuān de nǚháizi yìqǐ chīfàn, nàme nǐ zuìhǎo mǎidān.

Because in China, if you eat with the girl you like, then it's best that you pay the bill.