✔ 最佳答案
a.m. = ante meridiem(before noon)= 上午。
p.m. = 【拉】post meridiem = 下午。
am、pm 或者a.m.、p.m. 都得,兩個都係拉丁文–abbreviation.
a.m. (MORNING), (am) (ante meridiem: a.m., from Latin, literally "before midday") (adverb)
used when referring to a time between twelve o'clock at night and twelve o'clock in the middle of the day:
e.g. The first election results are expected around 1 a.m.
p.m. (TIME), pm (ABBREVIATION) (post meridiem: p.m., "after midday")
used when referring to a time in the afternoon or evening or at night:
e.g.1 We'll be arriving at about 4.30 p.m.
e.g.2 The 6pm train is usually very crowded.
上午,(Ante Meridiem)一個時間的單位用於十二小時制,拉丁文:Ante Meridiem 意為中午之前。
ante是字首,意為在時間、順序、位置上在前;post是字首,意為在時間、順序上在後。meridiem意為正午。所以ante meridiem是before noon; post meridiem是after noon.英文寫作antemeridian 及postmeridian.
在古代,像其他語言的縮略語一樣,英語縮略語多見於古幣、徽章、圖案和碑文,因為要在這些小小的物體上刻劃出較為複雜的內容,只有用縮略語。而這些古幣、 徽章、圖案等首選是因為商務交際的需要人們才使用的,可以說商務縮略語首選產生於商務這一語域中。縮略語也曾作為一種記事的符號和密碼。如古羅馬人把RSP( Roman Senate and People)當作“古羅馬的元老院”的縮寫語,把拉丁語Anno Domini (西元)縮寫為A.D.,把ante meridiem 和post meridiem 分別縮寫為a.m.和p.m.,這類古老的縮略語早已進入了詞典,廣泛被人們所使用。
下午,(post meridiem) 一個時間的單位用於十二小時制,拉丁文:Ante Meridiem 意為中午之後。