perfectly
adv. /ˈpɜːrfɪktli/ A2
完美地；完全地
In a way that has no faults or errors.
仙境例句
The Hatter cut the bread perfectly, each piece as thin as a playing card.
帽匠把面包切得完美无缺，每片都薄得像一张纸牌。
原著这一句
Father William replied to his son, “I feared it might injure the brain; But, now that I’m perfectly sure I have none, Why, I do it again and again.”
威廉爸爸回答儿子说：“我以前怕这会伤到脑子；但既然现在我完全确信自己根本没脑子，嗨，那我自然就倒立了一次又一次。”
卡罗尔原著 · 第 5 章