When female cowbirds raised in isolation in sound-proof chambers were exposed to recordings of male song, they responded by exhibiting mating behavior.
当把雌性牛鹂单独养在隔音的房间里，让它们听到雄性的歌声，它们就会表现出交配行为。
2
The G-222 aircraft, which were built between 1977 and 1985, are receiving avionics upgrades, while two will also be given sound-proof, VIP transport modules.