a crew of 891 一个由891名船员组成的船组(飞机上叫机组)
a crew of后一般要加数字. 当然,也有加其他名词的,要根据具体情况.
The ship had a crew of 48, exclusive of officers.
船上有乘员48人,不包括军官.
The next day a bark was prepared and a crew of stout rowers selected.
第二天准备好一艘三桅船和挑选了一组健壮的水手.10
Paul picked out a crew of men who could stand the heat better than others.
保罗挑选了一批最能忍受高温的汉子.