2 sentences for 师妹 (shī​mèi)

1. 她是我的师妹，比我晚一年进实验室。

   tā shì wǒ de shī​mèi, bǐ wǒ wǎn yī nián jìn shí​yàn​shì.

   She is my junior fellow student; she joined the lab a year after I did.

   Source: Dong Chinese Dictionary

2. 师父的小女儿也常来武馆，是我们的师妹。

   shī​fu de xiǎo nǚ'ér yě cháng lái wǔ​guǎn, shì wǒ​men de shī​mèi.

   The master's youngest daughter also frequently visits the martial arts hall and is our junior fellow student.

   Source: Dong Chinese Dictionary