Margin一词在商业贸易中确实经常用于指批零差价，或者指出厂价与成本的差额，又称毛利。比如财报中常见的gross margin可指毛利润或毛利率（视情况而定）。

但在证券交易中，margin则多指保证金。即在证券交易中指客户存于经纪人处的一笔钱或等价物，以保证经纪人不因股票价格波动而遭受损失。也指客户在使用经纪人的贷款进行证券交易时必须缴纳的押金。

margin transaction保证金交易

以保证金账户通过经纪人进行的证券或商品交易，即在购买股票或商品时，一部分用现金，即保证金支付，其余部分通常由经纪人提供贷款支付。

margin transaction也交margin trading。Margin trading, or “buying on margin,” means borrowing money from your brokerage company, and using that money to buy stocks. Put simply, you’re taking out a loan, buying stocks with the lent money, and repaying that loan — typically with interest — at a later date.

margin account保证金账户

证券业向客户提供信贷的一种方法，根据这种方法，客户从证券公司购买股票，只需预交部分价款，其余额由经纪公司给予贷款融资，经纪公司可将该股票留作抵押并收取贷款利息。margin finance account则指保证金融资账户，相当于借钱炒股。

A margin account is a brokerage account in which the broker lends the customer cash to purchase assets.

以下为相关双语示例，供参考：

The margin trading service described in this Agreement is not suitable for everyone and it is designed for clients who are knowledgeable and experienced in the financial services market and in the types of transactions described in this Agreement.

本协议所述的保证金交易服务并不适合每个人，该服务是专为有金融服务市场以及本协议所述交易类型知识与经验的客户而准备的。

Moreover, the complainant notes that he has never been a general director of Global Gamin Expo, has never signed any agreements with the clients on opening margin trading accounts and can therefore not be held liable for the obligations undertaken by the two directors, Felix Alexandrovich Porin and Ekaterina Andreevna Demesh, as all asset entry or withdrawal to/from the margin trading accounts were performed by them.

Global Gamin Expo 的总经理，从来没有 与客户签过任何关于开设保证金交易账户的协议， 因此不能够为两名董事Felix Alexandrovich Porin和 Ekaterina Andreevna Demesh承担的义务负法律责任，因为保证金交易账户的所有资产进账出账都由他们操作。