1
a greenback
He handed me a greenback.
他递给我一张美钞。
美钞
先理解核心含义，再看它在真实句子里的用法。
美钞
a piece of paper money (especially one issued by a central bank)
He handed me a greenback.
他递给我一张美钞。
尤指美元纸币
美元。
The United States dollar.
纸币(尤指中央银行发行的)
a piece of paper money (especially one issued by a central bank)
尚未开始破裂的波浪。
A wave that has not yet begun to break.
He pulled a greenback from his wallet to pay for the coffee.
他从钱包里抽出一张美钞来付咖啡钱。
The old man kept a stack of greenbacks hidden under his mattress.
老人把一叠美钞藏在床垫下。
She exchanged her euros for greenbacks at the currency exchange.
她在货币兑换处把欧元换成了美钞。
He handed me a greenback.
他递给我一张美钞。
常用复数形式
The drawer was full of greenbacks.
抽屉里装满了美钞。
The seller insisted on being paid in greenbacks.
卖家坚持要用美钞支付。
Not this
I have two greenback.
Use this
I have two greenbacks.
错误：greenback 是可数名词，复数形式为 greenbacks。原句缺少复数标记，改正后加上 -s 符合语法。
Not this
I don't have any greenback.
Use this
I don't have any greenbacks.
错误：在否定句中，any 后接可数名词复数形式。greenback 必须用复数 greenbacks 表示泛指。
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常用复数形式 greenbacks
页面下方列出了常见词形变化。学习时注意它们在句子中的语法位置。
Dictionary facts from ECDICT, WIKTIONARY.