bulkhead

n upright watertight partition or wall between compartments in a ship or aircraft （船舱或机舱的）防水隔板, 隔墙.

bugler, build, build a fire, build up, build-up, builder, building, building site, building society, buildings, built, built-in (also in-built), built-up, bulb, bulbous, bulge, bulgy, bulk, bulk buying, bulk order, bulky, bull, bull's-eye, bull-headed, bull-necked, bull-terrier, bulldog, bulldog clip, bulldoze, bulldozer, bullet, bullet-headed, bullet-proof, bulletin, bulletin board, bullfight, bullfighter, bullfighting, bullfinch, bullfrog,