A bottleneck is a place where a road becomes narrow or where it meets another road so that the traffic slows down or stops, often causing traffic jams.
N-COUNT
（阻礙進(jìn)展的）瓶頸，障礙
A bottleneck is a situation that stops a process or activity from progressing.
例句
He pushed everyone full speed ahead until production hit a bottleneck.他催促所有人拼命干活，直到生產(chǎn)遭遇瓶頸。