3 sentences

1. 这种老式挂锁的牡断了，钥匙怎么也转不动。

   zhè zhǒng lǎo​shì guà​suǒ de mǔ duàn le, yào​shi zěn​me yě zhuàn bù​dòng.

   The bolt of this old-fashioned padlock is broken, and the key won't turn.

   Source: Dong Chinese Dictionary

2. 牧场主经常通过体型来区分羊群中的牡和牝。

   mù​chǎng​zhǔ jīng​cháng tōng​guò tǐ​xíng lái qū​fēn yáng​qún zhōng de mǔ hé pìn.

   Ranchers often distinguish between males and females in a flock of sheep by their body size.

   Source: Dong Chinese Dictionary

3. 在一片平坦的荒原上，偶尔能看到几个起伏的小牡。

   zài yī piàn píng​tǎn de huāng​yuán shàng, ǒu'ěr néng kàn​dào jǐ gè qǐ​fú de xiǎo mǔ.

   On the flat wasteland, one can occasionally see a few undulating hillocks.

   Source: Dong Chinese Dictionary