求翻译：their optimal operating temperature of around 40 ◦C is the lowest reported value for such metal oxide semiconductor gas sensors ever achieved.是什么意思？

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悬赏分：1 - 离问题结束还有

their optimal operating temperature of around 40 ◦C is the lowest reported value for such metal oxide semiconductor gas sensors ever achieved.

问题补充：

匿名	2013-05-23 12:21:38 他们的最佳工作温度约40◦C是最低等金属氧化物半导体气体传感器不断实现价值。

匿名	2013-05-23 12:23:18

匿名	2013-05-23 12:24:58

匿名	2013-05-23 12:26:38

匿名	2013-05-23 12:28:18

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