slope可數(shù)還是不可數(shù)

　　例句：

　　The bank sloped down sharply to the river.

　　河岸到河面的斜坡非常陡。

　　The slopes are colonized by flowering plants.

　　坡地上長滿了開花植物。

　　The garden sloped gently downwards to the river.

　　花園向河邊呈緩坡傾斜。