shí / yàn / shì / zài / qiáng / tǐ / zhōng / jiā / rù / le / hòu / zhòng / de / hé / píng / bì / céng / yǐ / tí / gāo / ān / quán / xìng

实验室在墙体中加入了厚重的核屏蔽层，以提高安全性。

The laboratory added a thick nuclear shielding layer to the walls to improve safety.