I fill the channel halfway with emulsion.

Arabic: أملأُ المجرى حتى المنتصف بمادة الطلاء.

English: I fill the trough up to half way with the photo emulsion.

The coating trough is filled halfway with the photoemulsion.

Arabic: سيتم تعبئة المجرى بمادة الطلاء حتى المنتصف.

English: The coating trough is filled up to half way with the photo emulsion.