...ged for billions of years, but the ratio of fresh to
salt water has. 后面的句子,把changed省掉了,这是承前省略,可是其中的the ratio of
fresh to salt water 确正和它相反,the ratio of fresh (water)
to salt water。这两种情况正好在一个句子里,类似的还有...
...hat
might be an important influence against sexism in our society.and后面的chances与前面的the careers and professional
forture并列为什么要这样表达?而不是把它放在谓语will be的前面?