- 1
Headwaters are the small streams that form a river — the water at the beginning, often high up, before the river grows wide. We almost always say it in the plural: the headwaters of a river. You will meet it in geography, hiking, and nature news. "Head" here means the start, the way we also say the head of a line. Though actually, there is often no one you can point to; many little streams together are the headwaters, and people sometimes argue about the "true" source. It is a slightly formal, textbook word. In casual talk people may just say the source or the start of the river.
河源、源頭（一條河剛開始的那些小溪流；英語幾乎都用複數）
組成From head + waters. Head means the beginning or source; waters are the streams.
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。
headwatersnoun/ˈhɛdˌwɑtɝz/
- 1
The source of a river, the set of streams that feed into the river's beginning.
- ... but when his brows began to wrinkle with time, and he stood alone, the last of his family, and his particular tribe, the few Delawares, who yet continued about the head-waters of their river, gave him the mournful appellation of Mohegan.
- Driver Thornhill beckoned me across the cab and pointed out some two miles ahead as we looked across the headwaters of the Eden Valley, the summit cabin at Ais Gill itself, with the summit point and altitude conspicuously indicated.
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。