When you turn on a transistorized radio, the sound comes on immediately; when you turn off, it fades out gradually.
你打开
收音机, 立刻就有声音, 当你关掉它时, 声音渐渐消失。
,化;,不用真空;;
, 放大;
;;When you turn on a transistorized radio, the sound comes on immediately; when you turn off, it fades out gradually.
你打开收音机, 立刻就有声音, 当你关掉它时, 声音渐渐消失。
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