Some animals only half-hibernate,that is to say,their sleep

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Some animals only half-hibernate,that is to say,their sleep is not such a deep one
Some animals only half-hibernate是什么句子成分?that is to say是什么句子成分?

that is to say=即,名词性从句里面的同位语从句
Some animals only half-hibernate 独立主格.作用相当于一个状语.
再问： that is to say是插入语吧？
再答：我最初也是要回答插入语，但是你不是问句中成分吗。插入语确实准确些的。

Some animals only half-hibernate,that is to say,their sleep Some animals hibernate under snow,because there is much air some warm-blooded animals ( )hibernate. While there is some truth to this,that’s only half of the pi some animals wake up from their long sleep.什么意思英语翻译Hibernation is a long sleep that some animals take for t 翻译man is the only animal that goes to sleep when he is not s that is to say. that is to say 英语翻译Half the year.I understand that there is only a way to c That is to say,there is only one class for each g________.Al "but this is my trian.that man only came to say goodbye to m