LW is the written short form of long wave, a kind of radio. On an old radio, you may see LW, MW, SW, and FM as choices.

LW is the written short form of long waveLW是long wave（長波）的書寫縮寫 a kind of radio是一種無線電廣播 On an old radio, you may see LW, MW, SW, and FM as choices在舊式收音機上，你可能會看到LW、MW、SW和FM這些選項

Long wave uses radio waves that are, in simple terms, “long”: they can travel a long way, especially over land at night, which is why some countries used LW for news and talk that had to reach far. You mainly meet LW as letters on a dial, in a manual, or in a list of stations — it is a written abbreviation.

Long wave uses radio waves that are, in simple terms, "long"Long wave用的是簡單來說『波長很長』的無線電波 they can travel a long way它們可以傳得很遠 especially over land at night尤其是在夜間、經由陸地傳播時 which is why some countries used LW for news and talk that had to reach far這就是為什麼有些國家會用LW來播送需要傳得很遠的新聞和談話節目 You mainly meet LW as letters on a dial, in a manual, or in a list of stations你主要會在旋鈕、說明書，或電台列表上看到LW這幾個字母 it is a written abbreviation它是一個書寫用的縮寫

People often say “long wave” out loud rather than “L-W.” Though actually, LW can mean other things in other jobs (a size, a code, a science label), but on a radio it means this. It is not the same as FM, which is usually clearer but does not reach as far in the same way, and it is not a word you use in ordinary chat unless you are talking about radios.

People often say "long wave" out loud rather than "L-W."人們口頭上通常會說『long wave』，而不是唸『L-W』 Though actually, LW can mean other things in other jobs (a size, a code, a science label)不過實際上，LW在其他領域可能有別的意思（像尺寸、代號，或科學上的標籤） but on a radio it means this但在收音機上，它指的就是這個意思 It is not the same as FM它跟FM不一樣 which is usually clearer but does not reach as far in the same wayFM通常音質比較清楚，但傳不了那麼遠 and it is not a word you use in ordinary chat unless you are talking about radios而且除非你在聊收音機，不然平常聊天不會用到這個字