(come/walk) one after another in close succession ❍ 白求恩大夫惊奇地发现，献血者人山人海，～。Dr. Bethune was surprised to find that there was a sea of the blood donors who were coming one after another in close succession.
项背相望xiang bei xiang wang
walk one after another in close succession
项背相望xiànɡ bèi xiānɡ wànɡ
项：颈项；背：脊背。原指前后相顾；现多形容人来人往，非常拥挤。one after another in close succession, a huge jostling crowd