There are no shortcuts to learning a foreign language.

问题描述:

There are no shortcuts to learning a foreign language.
不明白to后边为什么加doing.怎么区分to是介词还是to do不定式

to作介词解释成:“到、朝...方向”,作不定式时没有实际意义.这里的 no shortcuts to的用法类似于the way to someplace,翻译成“到...没有捷径”,动名词短语learning a foreign language作宾语.这里用不定式to learn...