New words：

steeply /ˈstiːpli/ adv. 陡峭地；急剧地；大幅度地
steepness /ˈstiːpnəs/ n.陡峭；险峻；（数量、价格）急剧升降

必记高频搭配

rise / fall steeply 急剧上升 / 急剧下降

Prices have risen steeply this year.

The number of wild animals has fallen steeply.

slope steeply 坡度很陡

The hill slopes steeply on both sides.

the steepness of the slope 斜坡的陡峭度

The climbers were surprised by the steepness of the slope.

the steepness of a rise /fall 涨幅 / 跌幅之大

Everyone noticed the steepness of the price increase.

slope [sloʊp] v.倾斜；

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