芯 - wick

wick; marrow; staple (for stapler); (pencil) lead; stuffing; pith

dead center

toilet drain outlet

centering; center alignment

spare pencil lead; pen refill (cartridge); replacement wick (e.g. of a lantern)

lead of a pencil

padding; lining; foundation

dead center (of a baseball bat); sweet spot

staple (for a stapler)

mentally strong; strong-willed

Chinese water spinach (Ipomoea aquatica); ong choy; kang kong; water morning glory; water convolvulus; swamp cabbage; hung tsai; rau muong; pak boong; swamp morning-glory

pencil lead case (for a mechanical pencil)