Wavelength是“波段”，on the same wavelength是什么意思呢？请看对话：

    A: This is the seventh place I’ve looked at in two days. Hopefully, I’ll find my new apartment soon.

    B: Are you being picky?

    A: It’s not just the apartment. All the current housemates have to like me as well. They want to make sure the new housemate is on the same wavelength as the others.

    Note: Literally, “wavelength” refers to the distance between two waves of sound or light that are next to each other. If two people are on the same wavelength, it is easy for them to understand and agree with each other. Being on the same wavelength with someone else can refer to a mutual understanding between people. The figurative sense of “mental harmony” has been recorded since 1927, on analogy of radio waves.