they learn english (by)the radio. by“表达办法，手段”靠，用的意用，如send a message by radio.
they learn english (on )tv. on tv 是习习用法 如appear on tv
through 是能够的
但radio最常用 的而是 over
they learn english (through )the radio .
they learn english (by )tv.
看摘纳
they learn english (by )the radio .
they learn english ( on)tv.
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