grammarmedium
Not this
We need dredger to deepen the canal.
Use this
We need a dredger to deepen the canal.
dredger 是可数名词，单数形式前需要不定冠词 a/an；加上 a 后句子语法才完整。
挖泥船；疏浚机；采捞船
dredgers — plural of dredger
先理解核心含义，再看它在真实句子里的用法。
挖泥船；疏浚机；采捞船
a barge or similar vessel used for dredging (clearing mud, sand, etc. from the bottom of water)
The crew loaded sand onto the dredger before it moved to the next channel.
船员们在挖泥船开到下一条航道之前把沙子装上了船。
配备用于从海床清除沙子或沉积物的船只。
A vessel equipped for the removal of sand or sediment from the seabed.
用于疏浚的驳船(或类似驳船的船只)
a barge (or a vessel resembling a barge) that is used for dredging
使用捞网捕鱼的人。
One who fishes with a dredge.
疏浚机；挖泥机。
A dredging machine.
A large dredger is clearing mud from the river mouth to keep the waterway open.
一艘大型挖泥船正在清理河口淤泥，以保持航道畅通。
Workers are repairing the engine of the old dredger at the dock.
工人们正在码头上修理那艘旧挖泥船的发动机。
Not this
We need dredger to deepen the canal.
Use this
We need a dredger to deepen the canal.
dredger 是可数名词，单数形式前需要不定冠词 a/an；加上 a 后句子语法才完整。
Not this
A dredger is used to dredging rivers.
Use this
A dredger is used for dredging rivers.
表示用途时用 be used for + 动词-ing 或 be used to + 动词原形，而不是 be used to + 动词-ing。后者意为“习惯于……”，与“用于……”意思不同。
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Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
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Revisit a common error or keep this word in your review list.
有两个名词义项：疏浚船/挖泥机，以及撒粉器；都是可数名词。
页面下方列出了常见词形变化。学习时注意它们在句子中的语法位置。
Dictionary facts from ECDICT, WIKTIONARY.