“中起伏”怎么读？

草在风中起伏波动.The grass waved in the wind.我们很快看到一片麦田在微风中起伏。We soon see a field of wheat undulating in the breeze.我们很快看到一片在微风中起伏的麦田.We soon saw a field of wheat undulating in the breeze....

“中起伏”的英语可以翻译为：mesorelief ...