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Rainwater is water that has fallen as rain, as opposed to water from a river, a well, or a tap. People collect it in barrels for plants, and old houses sometimes used it for washing. In careful talk it is just that: rain that has landed and can be used or measured. Though actually, rainwater is not automatically clean to drink. Once it has hit a roof, a street, or a dirty tank, it has picked up other things. The word itself is neutral and everyday; it names the source of the water, not how safe it is.
雨水
原始詞典資料3 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。
Rainwatername
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A surname.
rainwaternoun
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Rainfall.
- In early December, as rainwaters had started the monthlong process of flooding mines and washing out rail lines, workers lined up before 1 p.m. at an easy-to-miss storefront depot in Mackay.
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Water (for a house, etc.) sourced from rain which has not joined a spring, stream or river, pond, lake or sea.
- Constructed of hard flint stone, which came as ballast from England and is now painted coral white, the house has a fishpond, or catchment, roof, dating from 1788, to collect rainwater.
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。