4 sentences

1. 他在赌场里换了一堆马子。

   tā zài dǔ​chǎng lǐ huàn le yī duī mǎ​zi.

   He exchanged a bunch of chips at the casino.

   Source: Dong Chinese Dictionary

2. 他在朋友面前炫耀自己的新马子。

   tā zài péng​you miàn​qián xuàn​yào zì​jǐ de xīn mǎ​zi.

   He showed off his new girlfriend in front of his friends.

   Source: Dong Chinese Dictionary

3. 那帮马子在荒郊野外抢劫了路过的商队。

   nà bāng mǎ​zi zài huāng​jiāo​yě​wài qiǎng​jié le lù​guò de shāng​duì.

   That gang of bandits robbed a passing caravan in the wilderness.

   Source: Dong Chinese Dictionary

4. 在没有室内厕所的年代，人们通常使用马子。

   zài méi​yǒu shì​nèi cè​suǒ de nián​dài, rén​men tōng​cháng shǐ​yòng mǎ​zi.

   In the days before indoor toilets, people usually used chamber pots.

   Source: Dong Chinese Dictionary