5 sentences

1. 工人们向模具里灌注水泥。

   gōng​rén men xiàng mú​jù lǐ guàn​zhù shuǐ​ní.

   Workers are pouring cement into the molds.

   Source: Dong Chinese Dictionary

2. 工人小心地把铁水浇进模具里。

   gōng​rén xiǎo​xīn de bǎ tiě​shuǐ jiāo jìn mú​jù lǐ.

   The worker carefully poured molten iron into the mold.

   Source: Dong Chinese Dictionary

3. 塑料在模具中冷却后即可成型。

   sù​liào zài mú​jù zhōng lěng​què hòu jí kě chéng​xíng.

   The plastic can be molded once it cools in the mold.

   Source: Dong Chinese Dictionary

4. 这种塑料在模具中加热后，很快就能成形。

   zhè zhǒng sù​liào zài mú​jù zhōng jiā​rè hòu, hěn kuài jiù néng chéng​xíng.

   This kind of plastic takes shape quickly once it is heated in the mold.

   Source: Dong Chinese Dictionary

5. 制造这种塑料零件需要使用精密的工业模具。

   zhì​zào zhè zhǒng sù​liào líng​jiàn xū​yào shǐ​yòng jīng​mì de gōng​yè mú​jù.

   Manufacturing these plastic parts requires precision industrial molds.

   Source: Dong Chinese Dictionary