Nearly ___ of the surface of our planet is covered by water.

问题描述:

Nearly ___ of the surface of our planet is covered by water.
老师给的答案为seven-tenths
但是分数的中间需不需要加连字符 是one third还是one-third
如果不加连字符,如two thirds作定语加连字符后需不需要去s,变为two-third 就像 a five-year-old girl一样
请具体回答,

seven-tenths 和seven tenths 都可以.
当分子大于一时, 分母,序数词,后必须有s


肯定不同five-year-old 是合成形容词, 直接接名词而分数,是指“整体:" 和部分”的关系, 常接表范围的of.."在。。。。之中“这没因果关系记住这一条:当分子大于一时, 分母(序数词)后必须有s