2 sentences for 大姐 (dà​jiě)

1. 我大姐今年大学毕业了。

   wǒ dà​jiě jīn​nián dà​xué bì​yè le.

   My eldest sister graduated from university this year.

   Source: Dong Chinese Dictionary

2. 大姐，打扰一下，请问附近有超市吗？

   dà​jiě, dǎ​rǎo yī​xià, qǐng​wèn fù​jìn yǒu chāo​shì ma?

   Excuse me, ma'am, is there a supermarket nearby?

   Source: Dong Chinese Dictionary