bottleneckn.
英 'bɒt(ə)lnek | 美 'bɑtlnɛk
中文n. 瓶颈；障碍物
词根词源
bottleneck (n.)also bottle-neck, "narrow entrance, spot where traffic becomes congested," 1896; from bottle (n.) + neck (n.). Meaning "anything which obstructs a flow" is from 1922; the verb in this sense is from 1928.
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