dam a river/stream
dam 作动词时后面直接跟被拦截的水道。
The villagers dammed the river to store water for the dry season.
村民们筑坝拦河，为旱季蓄水。
筑坝拦水；拦截
damming — present participle of dam
阻挡水流；控制；筑坝；[计] 直接存取法
阻挡水流
To block the flow of water.
一般现在时
Beavers dam streams with wood and mud.
河狸用树枝和泥巴堵住溪流。
past
They dammed the river to create a lake.
他们拦河筑坝，形成了一座湖。
现在完成时
The workers have dammed the valley to prevent flooding.
工人们已经筑坝拦住了山谷，以防洪水。
规则动词；注意拼写：dam → dammed/damming（双写 m）。
The beavers dammed the stream with branches and mud.
河狸用树枝和泥巴堵住了溪流。
用法提示：dammed 是 dam 的过去式；这里作及物动词，表示用物体堵住水流。
Workers are damming the river to create a reservoir.
工人们正在拦截河水，以建造一座水库。
用法提示：are damming 是 dam 的现在进行时；作及物动词，表示筑坝拦水。
The residents stacked sandbags to dam the rising floodwater.
居民们堆起沙袋，以阻挡不断上涨的洪水。
用法提示：to dam 是不定式，作目的状语；dam 作动词，意为阻挡水流。
dam 作动词时后面直接跟被拦截的水道。
The villagers dammed the river to store water for the dry season.
村民们筑坝拦河，为旱季蓄水。
dam up 强调把水流堵住、积起来。
Fallen trees dammed up the stream.
倒下的树木堵住了小溪。
up 是副词，可放在宾语之前或之后。
The farmer dammed the stream up to irrigate his fields.
农夫把小溪筑坝拦住，用来灌溉田地。
grammar · medium
易错句子The beavers are damning the stream with branches and mud.
正确表达The beavers are damming the stream with branches and mud.
damming 是动词 dam（筑坝拦截）的现在分词，单音节重读闭音节要双写末尾的 m。damning 则是另一个动词 damn（谴责、咒骂）的现在分词，拼写只差一个 n，意思却完全不同，因此这里必须写 damming。
grammar · medium
易错句子The river was damed by the beavers last spring.
正确表达The river was dammed by the beavers last spring.
dam 是“辅音字母 + 元音字母 + 辅音字母”结尾的重读单音节动词，加 -ed 时需双写末尾的 m，故过去式和过去分词均为 dammed，不能写成 damed。
在河上筑坝拦水
They dammed the river to build a reservoir.
他们在河上筑坝以修建水库。
堵住；拦蓄（水流）
Beavers dammed up the stream with sticks and mud.
海狸用树枝和泥把溪流堵住了。
阻断水流
A landslide dammed the flow of the river.
山体滑坡阻断了河水的流动。
在溪流上筑坝
The children dammed the stream with rocks.
孩子们用石头在溪流上筑了坝。
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