他未经邀请就坐到了主宾的位置上，真是太冒失了。
It was quite presumptuous of him to take the guest of honor's seat without being invited.
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presumptuous英 /prɪˈzʌmptʃuəs/|美 /prɪˈzʌmptʃuəs/
解释
presumptuous 是由动词 presume（假定、擅自）加上形容词后缀 -uous 构成的形容词。presume 本身由前缀 pre-（预先）和 sume（拿、取）组成，字面意思是"预先拿取"。
presumptuous 形容人"自以为是的、冒失的"，指在没有充分依据或未经允许的情况下擅自行动或做出判断。
It was quite presumptuous of him to take the guest of honor's seat without being invited.
presumptuous 是由动词 presume（假定、擅自）加上形容词后缀 -uous 构成的形容词。presume 本身由前缀 pre-（预先）和 sume（拿、取）组成，字面意思是"预先拿取"。 presumptuous 形容人"自以为是的、冒失的"，指在没有充分依据或未经允许的情况下擅自行动或做出判断。