moss grows on sth
泛指苔藓时 moss 不可数，谓语动词用单数。
Moss grows on damp rocks and the bark of old trees.
苔藓生长在潮湿的岩石和古树的树皮上。
苔藓
mosses — plural of moss
苔藓种类；苔藓的一种；各种小型绿色无种子植物,生长在地面或树木、石头等表面；现特指苔藓植物门的植物；小型有叶茎的无花植物；这种植物的种类或品种；泥沼
a small green plant that grows in soft dense clumps on the ground, trees, stones, etc.
各种小型绿色无种子植物,生长在地面或树木、石头等表面；现特指苔藓植物门的植物
Any of various small, green, seedless plants growing on the ground or on the surfaces of trees, stones, etc.; now specifically, a plant of the phylum Bryophyta (formerly division Musci).
小型有叶茎的无花植物
tiny leafy-stemmed flowerless plants
这种植物的种类或品种
A kind or species of such plants.
The north side of the old wall is covered with soft green moss.
旧墙的北面覆盖着柔软翠绿的苔藓。
用法提示：moss 为不可数名词，指覆盖墙面的绿色苔藓植物。
We walked carefully over the moss on the wet forest floor.
我们小心翼翼地走过湿漉漉的林地上那层苔藓。
用法提示：moss 为不可数名词，指林地表面生长的一层苔藓。
This garden contains several rare mosses that grow only in cool, shady spots.
这座花园里有几种罕见的苔藓，它们只在凉爽背阴的地方生长。
用法提示：mosses 为可数名词复数，指不同种类的苔藓植物。
泛指苔藓时 moss 不可数，谓语动词用单数。
Moss grows on damp rocks and the bark of old trees.
苔藓生长在潮湿的岩石和古树的树皮上。
with 和 in 都可以用；be covered with moss 更强调表面被覆盖的状态。
The garden wall is covered with moss.
花园的墙上长满了苔藓。
指某一种苔藓时 moss 可作可数名词，复数为 mosses。
This rare species of moss only grows in wet mountain valleys.
这种稀有的苔藓只生长在潮湿的山谷里。
grammar · medium
易错句子The old stone wall is covered with mosses.
正确表达The old stone wall is covered with moss.
表示成片覆盖、无法逐个数清的苔藓时，moss 是不可数名词，不能加 -es；mosses 只用于指苔藓的不同种类。汉语“苔藓”本身没有单复数变化，所以容易顺手加上复数词尾。
grammar · medium
易错句子There is a moss growing on the rock.
正确表达There is moss growing on the rock.
在“岩石上长着苔藓”这一泛指用法中，moss 是不可数名词，不能加不定冠词 a；只有特指“一种苔藓”时才可数。汉语说“一块苔藓”时的量词习惯容易让学习者直译成 a moss。
grammar · medium
易错句子Moss are small green plants that grow on rocks.
正确表达Moss is a small green plant that grows on rocks.
moss 在此作不可数名词表示整类，谓语动词要用单数 is/grows，与主语保持一致；汉语没有主谓一致的变化，学习者容易受“植物”复数概念影响误用 are。
长满苔藓的
We rested on the cool, moss-covered stones.
我们在凉爽的、长满苔藓的石头上休息。
苔藓生长
Moss grows best in damp, shaded places.
苔藓最适合在潮湿阴凉的地方生长。
一层苔藓
The forest floor was carpeted with a thick bed of moss.
林地上铺着厚厚的一层苔藓。
被苔藓覆盖
The garden wall was completely covered in moss.
花园的墙完全被苔藓覆盖了。
苔藓和地衣
Grey rocks, streaked with moss and lichen, lined the path.
小径两旁是布满苔藓和地衣的灰色岩石。
Choose the next layer that will help you use mosses with more confidence.
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泥炭藓
Gardeners mix peat moss into the soil to hold water.
园丁把泥炭藓混入土壤中以保持水分。