Biunique
a. [数]一( 对) 一的, [语]单向双系列对应的
🗣️ 情景例句
May I help you, sir?
需要我帮忙吗，先生？
What is thelargest industrial center in this country?
这个国家最大的工业区是哪里？
He could not find his fifty pence piece anywhere, and what is more,
但他摸了半天也没找到那50便士硬币，