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An earthwork is a large, often long pile of soil built as a bank or wall. In the past, people made earthworks to stop attacks: to slow an army, guard a camp, or ring a hill fort. You can still walk along some of them as ridges. Though actually, engineers also use earthwork for any big digging and piling of soil when they make roads, railways, or dams — not a fight at all. books mean the old defensive bank; building sites mean the soil-moving job. In the history sense it is a thing you can count: an earthwork, several earthworks.
土壘、土堤（古時堆土防禦；工程上也可指土方）
原始詞典資料1 筆記錄
以下是外部詞典記錄的用法，原文照列，我們還沒有寫成教學內容。上面的說明才是我們自己寫的；有些用法可能上面已經講過了。
earthworknoun/ˈɝθwɝk/
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Any structure made from earth, especially an embankment used for fortification or flood control.
- At the moment only some 35 miles of earthwork have been completed from Qum, and no permanent way has been laid.
- The line was built by navvies using little more than wheelbarrows and shovels, with whatever material was close at hand, and the railway suffered from earthworks problems right from the start.
資料來源：英文維基詞典 English Wiktionary（CC BY-SA 4.0）。 原文照列，未經改寫。