这不是动词不定式的句型,
the key to 3 各单词组成一个短语,
句型 The key to A is B 的意思是
A 的关键在于B
这个句型里
A 必须是名词或名词短语,B 可以是名词,名词短语或动词不定式引导的名词短语
比如
The key to success is hard work
A = success B = hard work
The key to doing something right is detailed planning and careful execution
A = doing something right B = detailed planning and careful execution
The key to doing anything well is to have a positive attitude
A = doing anything well B = to have a positive attitude
