名詞 mayday:

1. an internationally recognized distress signal via radiotelephone (from the French m'aider)

may.day

n.（名詞）
An international radiotelephone signal word used by aircraft and ships in distress.
呼救信號：遇險的飛機(jī)、船只等使用的國際無線電呼救信號

來源：
From French m`aidez [help me!]
源自 法語 m`aidez [救命]

<注釋>.Mayday, mayday!. comes the international distress signal over the radio,and nobody stops to ask why the first of May is being mentioned at a time of crisis.Mayday, in fact, has nothing to do with the first of May. Instead, it is a spelling that represents the pronunciation of Frenchm`aidez, .help me,. or the latter part of the phrase venez m`aider, .come help me,. either of which are quite appropriate at such a critical juncture.
.救命，救命!.無線電接收機(jī)中傳來國際遇險呼救信號，總有人詢問為何在危急時刻使用五月的第一天作為信號。實際上，Mayday 和五月份的第一天沒有任何關(guān)系。 相反，它只是和法語中m`aidez .幫助我.或短語 venez m`aider .來幫助我.的后半部分的讀音相同的一種拼寫， 均適用于指緊要關(guān)頭