| I | undulate |
|---|---|
| you | undulate |
| he/she/it | undulates |
| we | undulate |
| you | undulate |
| they | undulate |
| I | undulated |
|---|---|
| you | undulated |
| he/she/it | undulated |
| we | undulated |
| you | undulated |
| they | undulated |
| I | have | undulated |
|---|---|---|
| you | have | undulated |
| he/she/it | has | undulated |
| we | have | undulated |
| you | have | undulated |
| they | have | undulated |
| I | had | undulated |
|---|---|---|
| you | had | undulated |
| he/she/it | had | undulated |
| we | had | undulated |
| you | had | undulated |
| they | had | undulated |
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单语范例（未经PONS编辑处理）
There is a crown or tuft of undulate leaves at the apex of the trunk during the growing season which is throughout the winter months.
en.wikipedia.org It is straight and undulates gently as it skirts the edge of the hills to its northwest.
en.wikipedia.org Its leaves are variable, with undulate fringes and emit a sour scent when crushed.
en.wikipedia.org The track is relatively flat and undulates only when roads have to be crossed.
en.wikipedia.org The marquee section is defined by flanking pylons embracing a tall, glass block window whose surface undulates.
en.wikipedia.org