Pirn's optical band is a key component of photo-electrical weft feeler of back reflection type.

纱管反光带系返回反光式光电探纬装置的重要组成部分。

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When a raw of knots is finished the weft will run through compartment space between front and back warps.

每当一行结打完时，纬线从前经和后经的中间穿过。

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