关于Manhattan与prep语法中矛盾的一个地方求指教

蓝兰紫籽

我看到manhattan里面说“twice the water”这种表达方法是错的，因为“water”是“uncountable”名词
但是在prep1 66题有表达是“ten times the estimated population”??这怎么回事？难道population可数？？

Africa's black rhino population in the mid-1970's numbered about 20,000, ten times the estimated population of 2,000 in 1997.
a

(A) the estimated population

(B) that of their estimated population

(C) more than the population's estimated amount

(D) more black rhinos than their population estimate

(E) more than that of their population's estimated amount

蓝兰紫籽

自己顶起来

hoteldeville

water属实意名词，是现实中存在的，且不可数，自然不能用twice.population更像虚拟名词，是人类在文明发展过程中造出来的词汇，虽然不可数，但它代表一个数值，所以用twice没有问题。假如把water改为the weight/the volume of water 也可以用twice。
个人理解，仅供参考。