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字型
波动 bōdòng
undulate [ˈʌndjʊleıt] VB intr
undulate
波动 bōdòng
undulate
起伏 qǐfú
▶ undulation [ˌʌndjʊˈleıʃən] N
Present
Iundulate
youundulate
he/she/itundulates
weundulate
youundulate
theyundulate
Past
Iundulated
youundulated
he/she/itundulated
weundulated
youundulated
theyundulated
Present Perfect
Ihaveundulated
youhaveundulated
he/she/ithasundulated
wehaveundulated
youhaveundulated
theyhaveundulated
Past Perfect
Ihadundulated
youhadundulated
he/she/ithadundulated
wehadundulated
youhadundulated
theyhadundulated
PONS OpenDict

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Monolingual examples (not verified by PONS Editors)
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