Wake up and Get up have different meanings so they cannot be exchanged without a difference in meaning.
Wake up 和 Get up的意思不同，因此不能交替使用。
Wake up [weɪk] 醒来
Get up 起床
Wake up = to stop sleeping and open your eyes.
Wake up 的意思是醒来，睁开眼睛。
When your alarm clock goes off in the morning you wake up because you are no longer sleeping.
每天早上，闹钟开始响，你就醒了，不再处于睡眠状态。
You can wake up naturally (you body doesn't need to sleep any more) or something or someone can wake you up such as an alarm clock or a friend (or dog) jumping on your bed.
你可以自然醒（你的身体不再休息的时候）或某事、某人像闹钟一样把你叫醒，或是朋友（或狗狗）跳到你的床上吵醒你。
Wake up is a phrasal verb so only the first part, the verb, changes according to the tense.
Wake up是一个动词短语，因此在时态发生变化时，只有第一个动词wake随之变化。
Example sentences of Wake up:
• When she woke up, she no longer had a headache.
• 她醒来时头就不痛了。
• Let's have the surprise ready before he wakes up.
• 在他醒来前，我们先准备好惊喜。
• I hope she wakes up soon, we have to go.
• 我希望她马上就醒来，因为我们必须得走了。
To Wake (someone) up = To cause someone to stop sleeping.
To Wake (someone) up的意思是叫醒某人。
The person that is being woken up (the object) is placed between the words Wake and Up. Often an object pronoun is used instead of the noun (or name).
被叫醒的某人（宾语）的位置是在单词wake与up之间。宾语通常用代词来代替名词（人名）。
Example sentences of Wake (someone) up:
• John woke his friend up by throwing a bucket of water on him.
• John向他的朋友泼了桶水，把他叫醒。
• A strong earthquake woke us up.
• 强烈的地震把我们吵醒了。
Get up = to get out of bed (usually to start your day).
Get up的意思是起床（通常是开始新的一天）。
Get up can also mean: To go from a lying position onto your feet.
Get up还有一个意思：站起来。
• I got up in the middle of the night to find myself another blanket because I was cold.
• 我半夜起床再找条毯子盖上，因为我感觉很冷。
• I wake up around 7 o'clock but I don't get up until around 8. I like to lie in bed reading before I start my day.
• 我7点左右就醒了，但8点左右才起床。我喜欢在新的一天开始前在床上看书。
• I have to get up eaily tomorrow because it will be a busy day.
• 明天是忙碌的一天，我必须早点起床。
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