Biconcavity
n. biconcave的變形
??? 情景例句
Everything is fine, Michelle.
一切都好， Michelle。
What's your nationality?Are you a Chinese?
你的國籍是什么？你是中國人?
suggested an idea on which he had been working for many years to the British Government and industrial circles.
他向英國政府和工業(yè)界提出了他研究多年的一項計劃。