I. rain [reın] 名词
II. rain [reın] 动词 不及物动词
| I | rain |
|---|---|
| you | rain |
| he/she/it | rains |
| we | rain |
| you | rain |
| they | rain |
| I | rained |
|---|---|
| you | rained |
| he/she/it | rained |
| we | rained |
| you | rained |
| they | rained |
| I | have | rained |
|---|---|---|
| you | have | rained |
| he/she/it | has | rained |
| we | have | rained |
| you | have | rained |
| they | have | rained |
| I | had | rained |
|---|---|---|
| you | had | rained |
| he/she/it | had | rained |
| we | had | rained |
| you | had | rained |
| they | had | rained |
单语范例（未经PONS编辑处理）
Acid rain from local sources and from the long-range transport of airborne pollutants has already taken an ominous toll.
en.wikipedia.org Acid rain is caused by emissions of sulfur dioxide and nitrogen oxide, which react with the water molecules in the atmosphere to produce acids.
en.wikipedia.org They increase the acidity of the atmosphere and form acid rain.
en.wikipedia.org The smelting is directly responsible for severe pollution, generally acid rain and smog.
en.wikipedia.org Many of these communities claim that nearby flares cause acid rain which corrodes their homes and other local structures, many of which have zinc-based roofing.
en.wikipedia.org