trading cast的用法和样例：
例句
- By thronging together, they create large, liquid markets that drive down trading costs and reduce risks by allowing large deals to be handled.
通过邻近的办公地点，创造了巨大的流动市场，从而降低了交易成本，减少了大宗交易的风险。 - Alternative trading networks are most common in America, where they have helped to push the cost of trading relentlessly lower.
在美国，交易所以外的交易网络已经如此普通，无情的将交易成本压得更低。
