km is the short written form of kilometre or kilometres, the metric unit of distance. One kilometre is 1,000 metres — about a long walk, or a bit more than half a mile. You see km on road signs, maps, running apps, and science work.

kmkm is the short written form of kilometre or kilometres是kilometre或kilometres的縮寫, the metric unit of distance也就是公制的距離單位。One kilometre is 1,000 metres一公里是1000公尺 — about a long walk大概是一段長距離的散步, or a bit more than half a mile或比半英里多一點。You see km你會在 on road signs, maps, running apps, and science work路標、地圖、跑步App和科學文章裡看到km。

When you read it aloud, say “kilometre” or “kilometres,” not the letters K-M, except when you are spelling it out. In American spelling you will also meet kilometer.

When you read it aloud唸出來的時候, say “kilometre” or “kilometres,”要唸作kilometre或kilometres, not the letters K-M而不是唸K-M這兩個字母, except when you are spelling it out除非你是在拼字母。In American spelling在美式拼法裡, you will also meet kilometer你也會看到kilometer這個拼法。

Though actually, in everyday Taiwan life people often say the Chinese word and still write km, especially on signs and in sports.

Though actually不過其實, in everyday Taiwan life在台灣的日常生活裡, people often say the Chinese word and still write km人們常常說中文「公里」但還是寫km, especially on signs and in sports尤其是在標示牌和運動場合。

In scientific writing there is no period: km, not km. For speed you will see km/h — kilometres per hour.

In scientific writing在科學寫作裡, there is no period: km, not km.沒有句點：寫km，不是km.。For speed講速度時, you will see km/h你會看到km/h — kilometres per hour意思是每小時幾公里。