Concaving
v. 凹的( concave的現在分詞 ); 凹地; 凹面, 成凹形
??? 情景例句
It was my pleasure.
這是我的榮幸。
Friends may meet, but mountains never greet.
朋友可相逢，高山永分離。
In their efforts to persuade us to buy this or that product, advertisers have made a close study of human nature and have classified all our little weaknesses.
做廣告的人在力圖勸說我們買下這種產品或那種產品之前，已經仔細地研究了人的本性，并把人的弱點進行了分類。