1
verb + rainwater
动词常用collect、store、use等，rainwater作宾语。
They collect rainwater to water the plants.
他们收集雨水来浇灌植物。
雨水
先理解核心含义，再看它在真实句子里的用法。
雨水
rainwater
They collect rainwater to water the plants.
他们收集雨水来浇灌植物。
降雨
Rainfall.
从云中降落的淡水水滴
drops of fresh water that fall as precipitation from clouds
源自雨水的水(如用于房屋等),未汇入泉、溪、河、池塘、湖泊或海洋
Water (for a house, etc.) sourced from rain which has not joined a spring, stream or river, pond, lake or sea.
We collected rainwater in a barrel to water the garden.
我们把雨水收集在桶里用来浇灌花园。
After the storm, the rainwater formed small pools on the path.
暴风雨过后，雨水在路上形成了小水洼。
The plants will be healthier if you use rainwater instead of tap water.
如果你用雨水而不是自来水浇灌，这些植物会长得更好。
动词常用collect、store、use等，rainwater作宾语。
They collect rainwater to water the plants.
他们收集雨水来浇灌植物。
rainwater可作定语修饰名词，表示该名词的用途或来源。
We bought a rainwater tank for the garden.
我们为花园买了一个雨水箱。
此结构用容器名词表示雨水的量。
A barrel of rainwater can be heavy.
一桶雨水可能很重。
Not this
There is a rainwater on the roof.
Use this
There is rainwater on the roof.
rainwater 是不可数名词，泛指雨水时不能用不定冠词 a。去掉 a 后句子才符合英语可数规则。
Not this
Listen, the rainwater is falling outside.
Use this
Listen, the rain is falling outside.
表示“下雨”这一天气现象用 rain，不用 rainwater。rainwater 专指作为水的“雨水”，不能描述降雨的动作。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
收集雨水
We installed a barrel to collect rainwater for the garden.
我们装了一个桶来收集雨水浇花园。
雨水收集利用
Rainwater harvesting can reduce household water bills.
雨水收集利用可以降低家庭水费。
雨水储罐
The house has a rainwater tank in the backyard.
这所房子后院有一个雨水储罐。
雨水径流
Rainwater runoff carries pollutants into rivers.
雨水径流把污染物带入河流。
雨水排水
Proper rainwater drainage prevents flooding.
良好的雨水排水可以防止洪涝。
雨水收集系统
They installed a rainwater collection system for irrigation.
他们安装了雨水收集系统用于灌溉。
发长 /eɪ/ 音 (如 rain, wait)
Use rainwater naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
rain（雨）+ water（水），雨水就是天上落下的水。
语域：neutral 常见场景：谈论收集雨水、园艺或环保话题、建筑或供水说明 rainwater 是中性常用词，多用于日常或环保、园艺等话题，正式和口语中都可以使用。通常指从天上落下的雨水，区别于自来水或处理过的水。
rainwater /ˈreɪnˌwɔtɚ/ ends in the /wɔtɚ/ sound, so it rhymes with water, daughter, and slaughter. Rain, brain, and train match the first /reɪn/ part but do not rhyme with the whole word. Don't confuse it with rainwear /ˈreɪnwɛr/, which looks similar but sounds different.
Dictionary facts from ECDICT, WIKTIONARY.