你好!twenty 英[ˈtwenti] 美[ˈtwɛnti, ˈtwʌn-] n. 二十,二十个; 二十多岁; 二十年代; 许多,大量; num. 二十; adj. 二十的; [例句]They're both in their twenties and both married with children of their own.他们俩都二十几岁,都已经结婚生子了。
百分号%的读法是 percent [pə'sent] 先读数字,再读百分号,跟中文习惯相反。 例如,20%---twenty percent 50%---fifty percent 最后那句英文这样说更有礼貌:For our first cooperation, I will appreciate that 50% of the payment is paid in advance as deposit.