Performic acid
[化] 过甲酸
🧩 词语组成解析
🗣️ 情景例句
You're most welcome.
不用客气。
I'm afraid so.
恐怕是这样。
it has to develop (partly by means of touch) the ability to judge roughly three-dimensonal distances.
儿童必须发展（部分通过触觉）粗略判断三维空间距离的能力。