[解析]
M：Hello，listeners.People around the world are reporting that birds are much louder these days.Now I've connected with doctor Zollinger and let's hear what she will say.
W：We feel that they're singing louder because they sing in typically noisy places.But when the noise is gone，they sing quieter than they normally do.
M：In other words，birds are like us in a noisy bar，for example，people will raise their voices.
W：Exactly.We know that birds sing quieter on the weekend mornings.This is because the noise levels are lower than the weekday rush.That's probably what's happening now.Here I've recorded a call of the songbird.Listen to see if you can hear the difference.
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