1 sentence

1. 这种拼合工艺要求极高，接缝处几乎无间。

   zhè zhǒng pīn​hé gōng​yì yāo​qiú jí gāo, jiē​fèng chù jī​hū wú jiàn.

   This jointing process is highly demanding, and the seams are almost seamless.

   Source: Dong Chinese Dictionary