5 sentences

1. 这是一种合成气体。

   zhè shì yī zhǒng hé​chéng qì​tǐ.

   It's a synthetic gas.

   Source: OpenSubtitles

2. 这种材料是人工合成的，性能非常稳定。

   zhè zhǒng cái​liào shì rén​gōng hé​chéng de, xìng​néng fēi​cháng wěn​dìng.

   This material is synthetic, and its performance is very stable.

   Source: Dong Chinese Dictionary

3. 二茂铁常在有机合成中作为添加剂使用。

   èr​mào​tiě cháng zài yǒu​jī hé​chéng zhōng zuò​wéi tiān​jiā​jì shǐ​yòng.

   Ferrocene is often used as an additive in organic synthesis.

   Source: Dong Chinese Dictionary

4. 这种运动服采用了透气性良好的合成纤维面料。

   zhè zhǒng yùn​dòng​fú cǎi​yòng le tòu​qì​xìng liáng​hǎo de hé​chéng xiān​wéi miàn​liào.

   This sportswear is made from a synthetic fiber fabric with good breathability.

   Source: Dong Chinese Dictionary

5. 这支部队是由三个营合成的。

   zhè zhī bù​duì shì yóu sān gè yíng hé​chéng de.

   This unit is composed of three battalions.

   Source: Dong Chinese Dictionary