6 sentences

1. 水中含有一些杂质。

   shuǐ zhōng hán​yǒu yī​xiē zá​zhì.

   The water contains some impurities.

   Source: Dong Chinese Dictionary

2. 磷在硅中充当施主杂质。

   lín zài guī zhōng chōng​dāng shī zhǔ zá​zhì.

   Phosphorus acts as a donor impurity in silicon.

   Source: Dong Chinese Dictionary

3. 活性炭常用于吸附水中的杂质。

   huó​xìng​tàn cháng​yòng yú xī​fù shuǐ zhōng de zá​zhì.

   Activated carbon is often used to adsorb impurities in water.

   Source: Dong Chinese Dictionary

4. 这种丝绸的色非常纯正，没有杂质。

   zhè zhǒng sī​chóu de sè fēi​cháng chún​zhèng, méi​yǒu zá​zhì.

   The color of this silk is very pure and free of impurities.

   Source: Dong Chinese Dictionary

5. 这种筛子的目太大了，过滤不掉杂质。

   zhè zhǒng shāi​zi de mù tài dà le, guò​lǜ bù diào zá​zhì.

   The mesh of this sieve is too large to filter out impurities.

   Source: Dong Chinese Dictionary

6. 在P型半导体中，受体杂质的浓度决定了空穴的数量。

   zàiP xíng bàn​dǎo​tǐ zhōng, shòu​tǐ zá​zhì de nóng​dù jué​dìng le kòng​xué de shù​liàng.

   In P-type semiconductors, the concentration of acceptor impurities determines the number of holes.

   Source: Dong Chinese Dictionary