It narrowed down to a mere contest of endurance.这件事结果纯粹成了耐力的较量。The number of the competitors at last narrowed down to only less than 100.参赛者的数量竟然缩减到不足100人。Their demands had narrowed down to only two points.他们的要求已减少到只有两点。The choices have been narrowed down to two.选择范围缩小到了两个。