an undercharge of + 金额
介词 of 后接具体金额或数量，用来说明少收的数额。
The mistake led to an undercharge of twenty dollars.
这个错误导致少收了二十美元。
少于正确金额的收费；低的索价；不够量的装填
A charge that is lower than the correct or expected amount.
少于正确金额的收费
A monetary charge that is less than the correct amount.
The waiter apologized for the undercharge on our dinner bill.
服务员为我们晚餐账单上少收的钱道了歉。
用法提示：这里 undercharge 是名词，指少收的费用，作介词的宾语。
After checking the receipt, she realized there had been an undercharge.
查看收据后，她意识到有一笔少收的钱。
用法提示：undercharge 是名词，表示少收的款项，作 there had been 的主语。
The accountant discovered several undercharges in last month's invoices.
会计发现上个月的发票里有几处少收费用的地方。
用法提示：undercharges 是名词复数，指多笔少收的费用，作 discovered 的宾语。
介词 of 后接具体金额或数量，用来说明少收的数额。
The mistake led to an undercharge of twenty dollars.
这个错误导致少收了二十美元。
常与 correct、fix 等动词搭配，表示纠正少收的款项。
The shop corrected the undercharge as soon as the error was found.
商店一发现错误就更正了少收的费用。
介词 on 引出出现少收情况的那份账单或收据。
There was an undercharge on the hotel bill.
酒店账单上有一处少收的款项。
grammar · medium
易错句子The cashier found undercharge of five dollars on the receipt.
正确表达The cashier found an undercharge of five dollars on the receipt.
undercharge 是可数名词，单数形式指“一笔”少收的款项，前面必须有冠词或限定词（a/an、the 等）；汉语名词没有冠词，学习者常直接省略，导致可数名词单数“裸用”。
grammar · medium
易错句子The audit revealed three undercharge in last month's bills.
正确表达The audit revealed three undercharges in last month's bills.
undercharge 为可数名词，前面有数词 three 表示不止一笔时，必须用复数形式 undercharges；汉语名词不通过词形标复数，学习者容易保留原形。
grammar · medium
易错句子The factory was fined for the undercharge of its workers' wages.
正确表达The factory was fined for the underpayment of its workers' wages.
undercharge 只表示“向顾客收取的金额少于应收数”，动作方向是收款；少付给工人工资应说 underpayment。汉语“少收”和“少付”都用“少”，学习者易把两个方向相反的词混用。
undercharge 指应收金额少于正确数额（名词，少收的差额）；overcharge 指收取金额高于正确数额（名词，多收的差额）。两者方向相反，账单中不能互换：少收用 undercharge，多收用 overcharge。
undercharge 是名词，指价格或账单上少收的金额；underpay 是动词，指少付给某人工资或报酬，宾语通常是人或工资款项，不用于账单金额本身。
undercharge 是收费不足后少收的差额；surcharge 是在正常费用之外额外加收的费用。两者都涉及费用，但一个表示少收，一个表示加收，不能互换。
under- + charge + -ed
under- + charge + -ing
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