3 sentences

1. 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

2. 许多加工食品都含有防腐剂和其他添加剂。

   xǔ​duō jiā​gōng shí​pǐn dōu hán​yǒu fáng​fǔ​jì hé qí​tā tiān​jiā​jì.

   Many processed foods contain preservatives and other additives.

   Source: Dong Chinese Dictionary

3. 新修订的食管法加强了对食品添加剂的监管。

   xīn xiū​dìng de shí​guǎn fǎ jiā​qiáng le duì shí​pǐn tiān​jiā​jì de jiān​guǎn.

   The newly revised Food Safety Law has strengthened the regulation of food additives.

   Source: Dong Chinese Dictionary