bottleneck

n.瓶颈口,(喻)交通易阻塞的狭口;妨碍生产流程的一环

botanical, botanist, botanize, -ise, botany, botch, botch (also botch-up), botcher, both, both...and, both...and..., bother, botheration, bothersome, bottle, bottle bank, bottle-feed, bottle-green, bottle-neck, bottle-opener, bottle-party, bottler, bottom, bottom drawer (US hope chest), bottom line (infml 口), bottom-line, bottomless, bottommost, botulism, boudoir, bouffant, bougainvillaea, bough, bought, bouillon, boulder, boulevard, bounce, bouncer (also bumper), bouncing, bouncy,