Touching
来自Big Physics
late Middle English (as a preposition): from French touchant, present participle of toucher ‘to touch’; the adjective (early 16th century) is from touch + -ing2.
wiktionary
From Middle English touchynge, equivalent to touch + -ing.
From Middle English touching, touchinge, touchynge, equivalent to touch + -ing.
etymonline
touching (adj.)
"affecting the emotions," c. 1600, present-participle adjective from touch (v.).
touching (prep.)
"concerning, regarding," late 14c., from touch (v.), on model of French touchant.