Yes,it fits perfectly.
是的，合身极了。
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📚 句中词汇解析
从本句中提取的重要词汇
adv. 完美地;理想地;完全地;无瑕疵地;
💡 per全部+fect做+ ly ...地 → perfect全部做完=完美的+ly...地 → 完美地
"The witnesses were each perfectly certain of what they said."
证人们个个对自己所说的话十分肯定.
近义：ideally, optimally, pretty, quite, very, completely
反义：lamely, defectively, faultily