| I | riffle |
|---|---|
| you | riffle |
| he/she/it | riffles |
| we | riffle |
| you | riffle |
| they | riffle |
| I | riffled |
|---|---|
| you | riffled |
| he/she/it | riffled |
| we | riffled |
| you | riffled |
| they | riffled |
| I | have | riffled |
|---|---|---|
| you | have | riffled |
| he/she/it | has | riffled |
| we | have | riffled |
| you | have | riffled |
| they | have | riffled |
| I | had | riffled |
|---|---|---|
| you | had | riffled |
| he/she/it | had | riffled |
| we | had | riffled |
| you | had | riffled |
| they | had | riffled |
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单语范例（未经PONS编辑处理）
The males congregate in spawning grounds such as gravelly areas at the edges of lakes, shallow riffles or fast-flowing water.
en.wikipedia.org Many were modernized with larger cabs, higher stacks, some fitted with large smoke lifters with horizontal riffles.
en.wikipedia.org The knickpoint, where a head cut begins, can be as small as an overly-steep riffle zone or as a large as a waterfall.
en.wikipedia.org The runnel running through the canyon is the most spectacular at the time of snowbreak with the small riffles and falls.
en.wikipedia.org This fish can be found in riffles and shallow, fast-moving river water.
en.wikipedia.org