后加动词不定式to do ，call in to do中文意思是打电话来做某事
The latest research further confirms that the danger lies less in what a motorist's hands do when he takes a call than in what the conversation does to his brain.最新研究进一步证实，危险不在于司机接电话时双手的动作，而在于通话对大脑的影响。
