cs 比左呢條link 我話係答案: https://www.interactivebrokers.com/lib/cstools/faq/#/content/34481124 "for clients holding multiple currencies in an account, all currencies are detailed and then totaled in the Base Currency Summary section of the account's Activity Statement. Because FX transaction rates change from period to period, there will be differences in the translated base currency balances. This difference will be reflected in the Cash FX Translation Gain/Loss line. "