翻译和例句：
) and a chorus (合唱团) girl called Christine. With changes of scene and high-pitched (音调高的) songs ……
Secret language for kids老师听不见的手机铃声。KIDS hear it, but their teachers don't. "Teen Buzz" is aring tone(铃声) made in Britain. The sound is veryhigh-pitched(音调高的). Most grown-ups can't hear it, but kids ……
. They turned shorter waves into higher-pitched (音调高的) sounds and longer waves into lower-pitched sounds... into higher-pitched (音调高的) sounds and longer waves into lower-pitched sounds. Scientists then used ……
的),high-pitched(音调高的) songs are about many things: work, life and love. People sang them often many ……
make high-pitched (音调高的) sounds with their tail. The bird’s long tail wings are used to make... flying. As they fly, they can make high-pitched (音调高的) sounds with their tail. The bird’s long ……
(茎) are cut. It’s just too high-pitched (音调高的) for humans to hear.Microphones placed 10... out” due to lack of water, or when their stems (茎) are cut. It’s just too high-pitched (音调高的 ……
, or when their stems (茎) are cut. It’s just too high-pitched (音调高的) for humans to hear...” due to lack of water, or when their stems (茎) are cut. It’s just too high-pitched (音调高的 ……
(105 km) an hour when flying. As they fly, they can make high-pitched (音调高的) sounds with their tails..., they can make high-pitched (音调高的) sounds with their tails. The bird’s long tail wings are used to make ……
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