- helpfulto和heplfulfor都有"有助于"的意思,但helpfulto较常用于接sb,而helpfulfor也可以接sb,但多用于接sth或doingsth,表示"对....有益"。例:Swimmingishelpfulforbonesthatareporousandweak.游泳有助于改善骨质疏松和骨骼脆弱。Thissystemhasbeenexperimentedinpractica...
- 18033
- helpfulto和heplfulfor都有"有助于"的意思,但helpfulto较常用于接sb,而helpfulfor也可以接sb,但多用于接sth或doingsth,表示"对....有益"。例:Swimmingishelpfulforbonesthatareporousandweak.游泳有助于改善骨质疏松和骨骼脆弱。Thissystemhasbeenexperimentedinpractica...
- 21501