he wanted to know whether they could be an equally nutritious but more affordable alternative.
问题描述：
he wanted to know whether they could be an equally nutritious but more affordable alternative.
这个句子的意思大概明白.
1..
2.还有就是对whether和but在这个句子中的理解.
答
he wanted to know 【whether they could be an equally nutritious but more affordable alternative】.【】中句子是个宾语从句,作know的宾语.but用于连接两个表示转折关系的形容词 nutritious （有营养的）,more a...