While in stocks you pay interest for margin borrowing, in futures you can collectinterest on your margin.
买股票时，如果你借用保证金，是要支付利息的，买期货时，你的保证金可以为你带来利息。
2
In order to collect data from a location of interest, a user has to enable the required probe at that location.
为了从感兴趣的位置收集数据，用户必须在这个位置上启用所需的探测。
3
Another was to use foreign currency: the bank could lend, or accept a bill of exchange, in one currency and collect its debt in another, building a hidden rate of interest into the exchange rate.