1[N-COUNT 可数名词] 瓶颈路段;狭窄路段;交通拥堵地段;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.
2[N-COUNT 可数名词] 阻碍进展的瓶颈,障碍;A bottleneck is a situation that stops a process or activity from progressing.
He pushed everyone full speed ahead until production hit a bottleneck.