YOU SAID:

I am skiing down a very steep Hill

INTO JAPANESE

私は非常に急な丘をスキーで滑り降りています

BACK INTO ENGLISH

I'm skiing down a very steep hill

INTO JAPANESE

私は非常に急な坂をスキーで滑っています

BACK INTO ENGLISH

I am skiing down a very steep slope

INTO JAPANESE

私は非常に急な斜面をスキーで滑り降りています

BACK INTO ENGLISH

I am skiing down a very steep slope