- helpfulto和heplfulfor都有"有助於"的意思,但helpfulto較常用於接sb,而helpfulfor也可以接sb,但多用於接sth或doingsth,表示"對....有益"。例:Swimmingishelpfulforbonesthatareporousandweak.游泳有助於改善骨質疏鬆和骨骼脆弱。Thissystemhasbeenexperimentedinpractica...
- 21459
- helpfulto和heplfulfor都有"有助於"的意思,但helpfulto較常用於接sb,而helpfulfor也可以接sb,但多用於接sth或doingsth,表示"對....有益"。例:Swimmingishelpfulforbonesthatareporousandweak.游泳有助於改善骨質疏鬆和骨骼脆弱。Thissystemhasbeenexperimentedinpractica...
- 17991