build a dam across sth
across 也可换成 on 或 over，表示水坝横跨的河流或其他水域。
They built a dam across the river to store water for the dry season.
他们在河上筑了一座水坝，为旱季蓄水。
坝；水坝；堤坝
dams — plural of dam
水库；坝内蓄水；母兽；母畜；母亲；（牙科的）橡皮障；橡皮布；（国际跳棋的）王棋；十米；公丈
A barrier built across a river or stream to hold back or divert water, or to keep out the sea.
横跨水流的构筑物,用于拦阻部分或全部水流,通常为蓄水、引水或延缓蓄水排放以避免骤发洪水
A structure placed across a flowing body of water to stop the flow or part of the flow, generally for purposes such as retaining or diverting some of the water or retarding the release of accumulated water to avoid abrupt flooding.
雌性亲代,母亲,通常指动物繁殖中的母体
Female parent, mother, generally regarding breeding of animals.
拦截水流或阻挡海水的屏障
a barrier constructed to contain the flow of water or to keep out the sea
因建造此类构筑物而形成的水库
The water reservoir resulting from placing such a structure.
国际跳棋中的王棋
A kind of crowned piece in the game of draughts.
长度单位,等于十米
a metric unit of length equal to ten meters
牙科治疗中防止牙齿沾湿的装置,由橡胶薄片和固定带组成
A device to prevent a tooth from getting wet during dental work, consisting of a rubber sheet held with a band.
雌性亲代,尤指家畜的母畜
female parent of an animal especially domestic livestock
构成高炉炉缸前部的耐火砖墙或石块
A firebrick wall, or a stone, which forms the front of the hearth of a blast furnace.
The farmers built a dam across the river to water their fields in summer.
农民们在河上筑了一道坝，以便夏天灌溉田地。
用法提示：dam 为名词，指横跨河流拦水的坝。
After the storm, the dam held back the flood water and protected the village.
风暴过后，大坝挡住了洪水，保护了村庄。
用法提示：dam 为名词，指挡水的大坝。
Engineers inspect dams in this region every year to make sure they are safe.
工程师每年检查这个地区的水坝，确保它们安全。
用法提示：dams 是 dam 的复数形式，作名词，指多处水坝。
across 也可换成 on 或 over，表示水坝横跨的河流或其他水域。
They built a dam across the river to store water for the dry season.
他们在河上筑了一座水坝，为旱季蓄水。
定语从句用 that 或 which 均可，用来说明水坝的功能或位置。
The dam that controls the river was damaged in the earthquake.
控制这条河的那座水坝在地震中受损。
dam 可直接放在另一个名词前作定语，说明用途或对象，如 dam project（水坝工程）、dam safety（水坝安全）。
The government approved a new dam project last year.
政府去年批准了一个新的水坝项目。
grammar · medium
易错句子The villagers built dam across the river to store water.
正确表达The villagers built a dam across the river to store water.
英语可数名词单数在泛指时必须加不定冠词；汉语没有冠词，说“修坝”时不带任何冠词，学习者容易直接对应成 built dam。dam 是可数名词，这里指任意一座坝，所以要用 a dam。
grammar · medium
易错句子The old damn burst after three days of heavy rain.
正确表达The old dam burst after three days of heavy rain.
dam 与 damn 读音相同但词义无关：dam 指拦水的坝，damn 表示咒骂或“该死的”。表示水坝这一事物时只能拼作 dam，多写一个 n 就变成完全不同的词。
grammar · medium
易错句子The dam broke down after the earthquake.
正确表达The dam burst after the earthquake.
break down 是“（机器、车辆）停止运转、出故障”的短语动词，主语通常是人造机械，不能用于坝体溃决。坝垮塌、决口英语用 burst 或 collapse，因此把 broke down 换成 burst 才正确。
筑坝；建造水坝
The villagers worked together to build a dam across the river.
村民们齐心协力在河上筑起一座水坝。
水电站大坝
The hydroelectric dam supplies power to the whole region.
这座水电站大坝为整个地区供电。
大坝决口
Heavy rain caused the dam to burst, flooding nearby farms.
暴雨导致大坝决口，淹没了附近的农田。
混凝土坝
The concrete dam is more than fifty years old.
这座混凝土坝已有五十多年历史。
河狸坝
A beaver dam can turn a small stream into a pond.
河狸坝能把一条小溪变成池塘。
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Dictionary facts from DICTIONARY_API_DEV, ECDICT, WIKTIONARY.
灌溉坝
The irrigation dam helps farmers water their fields in the dry season.
灌溉坝帮助农民在旱季给田地浇水。