在温度降至100℃以下时才允许打开炉门的翻译：Only when the temperature had dropped to 100 ℃ below allow you to open the door 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

The temperature dropped to below 100 ℃ when allowed to open the door

Only when the temperature had dropped to 100 ℃ below allow you to open the door

When temperature drop to 100℃ below only then allows to open the fire door

正在翻译，请等待...

Only when the temperature had dropped to 100 ℃ below allow you to open the door