Grouping together make sense because the bigger the group, the greater the protection it provided.
句中 because 后句式结构怎么分析?the bigger the group 没有谓语动词be 感觉说不通,是什么语法现象省略吗?
是的,你的句子省略了系动词 was。
Grouping together make sense because the bigger the group, the greater the protection it provided.
=Grouping together make sense because the bigger the group was, the greater the protection it provided.
注意,这种省略只限于系动词 be。又如:
The higher the mountain (is), the rarer the air (is). 山愈高,空气愈稀薄。
The longer the journey (is), the more expensive the ticket (is). 旅程越长,票价越贵。