Uptime is the time during which a computer, a website, or a machine is working and people can use it. It is the opposite of downtime.

Uptime isUptime是 the time during which a computer, a website, or a machine is working電腦、網站，或機器正常運作 and people can use it大家可以使用的那段時間。It它 is the opposite of downtime是downtime的反義詞。

In computing you meet it most often as a promise or a measurement: a company that runs servers will say '99.9% uptime', meaning that out of all the hours in a year, the service was working for 99.9% of them and broken for the rest. Because of this, uptime is usually spoken about as a percentage or as a length of time — 'our uptime last month was 99.99%', 'the server has an uptime of 200 days', meaning it has been running for 200 days without being restarted.

In computing在電腦領域，you meet it most often as a promise or a measurement你最常會把它當成一種承諾或一種測量方式遇到：a company that runs servers will say經營伺服器的公司會說 '99.9% uptime''99.9% uptime', meaning that out of all the hours in a year意思是一年所有的時數裡, the service was working for 99.9% of them服務有99.9%的時間是正常運作的 and而 broken for the rest剩下的時間則是故障的。Because of this也因為這樣，uptime is usually spoken about as a percentage or as a length of timeuptime通常會用百分比或時間長度來講 — 'our uptime last month was 99.99%''our uptime last month was 99.99%', 'the server has an uptime of 200 days''the server has an uptime of 200 days', meaning意思是 it has been running for 200 days without being restarted這台伺服器已經連續運作了200天沒有重開機。

It is an uncountable noun, so you do not say 'an uptime' or 'uptimes'.

It is an uncountable noun這是不可數名詞，so所以 you do not say不能說 'an uptime''an uptime', or也不能說 'uptimes''uptimes'。

The word started in computing and factories, and it still feels technical; ordinary people rarely use it about their own laptop. In factory talk it means the time a machine is producing, as against the time it sits stopped for repair.

The word started in computing and factories這個字起源於電腦業和工廠，and而 it still feels technical到現在還是感覺很技術性；ordinary people rarely use it一般人很少會用它 about their own laptop來講自己的筆電。In factory talk在工廠的講法裡，it它 means the time a machine is producing指的是機器在生產的時間, as against the time it sits stopped for repair相對於它停下來維修的時間。

On Linux and Mac computers there is even a command called uptime that tells you how long the machine has been on. Downtime, its opposite, has escaped into everyday English and now also means personal rest time — but uptime has not made that jump, so it stays inside the technical world.

On Linux and Mac computers在Linux和Mac電腦上，there is even a command called uptime甚至有一個叫uptime的指令 that tells you會告訴你 how long the machine has been on這台機器已經開機多久了。Downtime, its oppositeDowntime，它的反義詞，has escaped into everyday English已經跳進日常英文裡，and now also means personal rest time現在也用來指個人的休息時間——but但 uptime has not made that jumpuptime沒有跟著跳過去，so所以 it stays inside the technical world它還是留在技術性的世界裡。