| 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）
The layer of ionospheric plasma with equal ionization (the reflective surface) is not fixed, but undulates like the surface of the ocean.
en.wikipedia.org One undulates in waves and the other is coiled, producing a corkscrew-like propulsion to move the cell.
en.wikipedia.org Its leaves are variable, with undulate fringes and emit a sour scent when crushed.
en.wikipedia.org It exhibits symmetrical pyramidal growth with willowy weeping pendulous branches and long narrow lanceolate leaves with undulate margins.
en.wikipedia.org The hind and outer margins of the forwings are distinctly undulate and entire wing margin is hairy.
en.wikipedia.org