帮我检查下面这句话的逻辑和语法和时态错误:The size of TmHoYAG rod is mathrmphi3times74mathrmmm^mathrm2 but the co-doped region is only of 36mm at the center of the rod On both ends two 19mm pure YAG are bonded End surface
The logic and grammar of the sentence are correct. However, there is a tense error in the last sentence. It should be "The cooling temperature was set to 19℃ during the experiment." as the experiment has already been conducted in the past.
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