钢圈

钢圈	gāng quān	wheel rim / underwire (in a bra)
钢	gāng	steel
圈	juān	to confine / to lock up / to pen in
圈	juàn	livestock enclosure; pen; fold; sty
圈	quān	circle; ring; loop (CL:个) / classifier for loops, orbits, laps of race etc / to surround; to circle