保證金結餘
margin balance
這是指保證金戶口內的未平倉淨結餘。如為負數，即指虧欠經紀行的金額；如為正數，則可賺取利息。
This is the net balance of open positions within the Margin Account. Such as negative, meaning that the amount owed brokerage firms; as a positive number, you can earn interest.