grass 是可数名词吗?为什么?

grass 是可数名词吗?为什么?
grass 是可数名词吗?为什么?

grass 是可数名词吗?为什么?
grass是一种种属名词吧看例句:
An expanse of ground,such as a lawn,covered with grass or similar plants.
应该是不可数的
另外还有动词词性
去下个金山词霸吧,还是挺方便的

grass
KK: []
DJ: []
n.
1. (青)草;牧草[U][C]
Cattle eat grass.
牛吃草。
2. 草地;草坪;牧地[U]
They are sitting on the grass.
他们坐在草地上。
3. 【植】禾本科植物[P1][U]
4. 【俚】大麻[U]
vt....

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grass
KK: []
DJ: []
n.
1. (青)草;牧草[U][C]
Cattle eat grass.
牛吃草。
2. 草地;草坪;牧地[U]
They are sitting on the grass.
他们坐在草地上。
3. 【植】禾本科植物[P1][U]
4. 【俚】大麻[U]
vt.
1. 【美】使吃草,放牧
2. 使长满草;在...上种草[(+over)]
vi.
1. 长草
可见，grass作不同意思讲时，又是可数有时不可数，知道就行了。

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grass1
/grɑːs; US græs; ɡræs/ n 1 [U] various kinds of common wild low-growing plants of which the thin green leaves and stalks are eaten by cattle, horses, sheep, etc 草; 牧草: a bl...

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grass1
/grɑːs; US græs; ɡræs/ n 1 [U] various kinds of common wild low-growing plants of which the thin green leaves and stalks are eaten by cattle, horses, sheep, etc 草; 牧草: a blade (ie leaf) of grass 一片草叶 * a meadow covered with/planted with grass 长著[种著]草的草地 * [attrib 作定语] grass seed 草籽 * a grass skirt, ie made of long dried grass, as worn in the S Pacific 草裙（以长乾草制成, 南太平洋地区人穿用）. 2 [C] any species of this plant (including, in botanical use, cereals, reeds and bamboos) 禾本科植物（植物学的用语, 包括谷类、 芦苇、 竹）: a study of different grasses 对各种草的研究. 3 [U] ground covered with grass; lawn; pasture 草地; 草坪; 牧场: Don't walk on the grass. 勿踏草坪. * mow the grass 割草 * cattle put out to grass, ie put in a field to eat the grass 在田野里牧放的牛. 4 [U] (sl 俚) marijuana 大麻. 5 [C] (Brit sl usu derog 俚, 通常作贬义) (used by criminals 罪犯用语) person who informs the police of criminal activities and plans 告密者. 6 (idm 习语) the grass is (always) greener on the other `side (of the fence) (saying 谚) (said of people who never seem satisfied and always think that others have a better situation than they have 用以指永不知足的人, 总以为别人的境况比自己的好). (not) let the grass grow under one's feet (not) delay in getting sth done 做事（不）拖拉. put sb out to `grass (infml) force sb to retire, esp because of old age 迫使某人退休（尤指因年老）. a snake in the grass => snake.
grass2
/grɑːs; US græs; ɡræs/ v 1 (a) [Tn, Tn.p] ~ sth (over) cover sth with turf 以草皮覆盖某物. (b) [Tn] (US) feed (animals) with grass 以草喂（动物）. 2 [I, Ipr] ~ (on sb) (Brit sl usu derog 俚, 通常作贬义) (used by criminals 罪犯用语) inform the police of sb's criminal plans or activities 向警方告密; 出卖: If anyone grasses on us, his life won't be worth living! 谁要是出卖我们, 他就别想活了!

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不可数
It's running across the grass.