目前我经历过的最长一次是做实验7个小时的翻译：Now experienced the longest time I was doing the experiment for 7 hours 什么意思？中文翻译英文，英文翻译中文，怎么说？

青云英语翻译

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Now experienced the longest time I was doing the experiment for 7 hours

At present I have experienced longest one time is does tests for 7 hours

At present, I have experienced the longest time was doing experiments 7 hours

Now experienced the longest time I was doing the experiment for 7 hours