thekey币(TheKey意大利)

I also realized I could get the meaning by listening for just the key words我也意识到，通过听取关键词我能明白意思I 是主语 also 是副词作状语，修饰谓语动词realizedI could get the meaning by listening。

两种结构都是正确的 the key to doing sth做的关键，是介词，to词性不会发生变化的，如果是表目的话就应该是不定式“to do sthquot。