瓶颈

瓶颈	píng jǐng	neck of a bottle / (fig.) bottleneck / problem that impedes progress
瓶	píng	bottle / vase / pitcher / CL:个 / classifier for wine and liquids
瓶	píng	variant of 瓶
颈	gěng	used in 脖颈
颈	jǐng	neck