纖芯直徑 xiān xīn zhí jìng

DEFINITIONS

  1. core diameter (of a fiber)

CHARACTERS

纖 xiān fine, delicate; minute; graceful
芯 xīn pith from rush (juncus effusus)
直 zhí
HSK 3
straight, erect, vertical
徑 jìng narrow path; diameter; direct