Monsieur is what you say to or about a French-speaking man, the way English uses Mr or sir. You can put it before a family name (Monsieur Dupont) or use it alone when you speak to a man you do not know well. In French writing it is often shortened to M.

Monsieur先生 is what you say to or about a French-speaking man是對說法語的男性的稱呼 the way English uses Mr or sir就像英文用Mr或sir一樣。You can put it before a family name你可以把它放在姓氏前面 (Monsieur Dupont)像Monsieur Dupont（杜邦先生） or use it alone when you speak to a man you do not know well也可以在對不熟的男性說話時單獨使用。In French writing it is often shortened to M.在法文書寫裡它常縮寫成M.。

It feels polite and a little formal. English keeps the French word when the man is French, or when the speaker wants the French flavour.

It feels polite and a little formal這個詞聽起來很有禮貌，也有點正式。English keeps the French word英文會保留這個法文詞 when the man is French, or when the speaker wants the French flavour當那個人是法國人，或說話者想帶點法式風味的時候。

It is not for a woman (that is Madame or Mademoiselle) and it is not a church title. A close-looking word, Monsignor, belongs to the Roman Catholic Church — different job, different word, even though both once meant something like my lord.

It is not for a woman它不是用在女性身上 (that is Madame or Mademoiselle)（女性用的是Madame或Mademoiselle） and it is not a church title而且它也不是教會的頭銜。A close-looking word, Monsignor一個長得很像的詞Monsignor（蒙席） belongs to the Roman Catholic Church屬於羅馬天主教會 different job, different word是不同的職位、不同的詞 even though both once meant something like my lord雖然兩個詞以前都有點像「我的大人」的意思。