undulation
🇺🇸
/ˌʌndʒəˈleɪʃn/
🇬🇧
/ˌʌndʒəˈleɪʃn/
A gentle wave-like form or movement.
The undulation of the hills created a beautiful view as the sun set.
山丘的起伏在日落時創造了美麗的景色。