期货市场的交易可以说是双向的(卖空和买空)。
Futures markets can be traded in both directions (up and down).
Richard Veryard一开始就指出的，SOA市场营销“牵涉双向交流[……]——这需要倾听业务需求，并对之做出回应。”
As Richard Veryard points out right from the beginning, SOA marketing "involves two-way communication [."..] - this entails listening and responding to what the business wants.
对冲基金可以起到稳定市场的作用。他们可以通过增加市场的流动性以及对市场的价格的双向变化都进行下注的方式来实现市场的稳定。
Hedge funds may have acted to stabilise markets by increasing liquidity and by betting on both falling and rising prices.
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