callicrein

例句：

1. 1. Theprocess of leather tanning involves the use of chemicals to remove the natural oils from the hide and create a smooth surface for the final product.
   皮革鞣制过程涉及使用化学物质从皮毛中去除天然油脂，为最终产品创造一个光滑的表面。
2. 2. The tanning agent used in this process is derived from animal skins and helps to preserve the quality of the leather.
   这种工艺中使用的鞣制剂是从动物皮肤提取出来的，有助于保持皮革的质量。
3. 3. The tanning agent used in this process is environmentally friendly and does not contain harmful chemicals that could harm humans orthe environment.
   这种工艺中使用的鞣制剂是环保的，不含对人体或环境有害的化学物质。