11行，声明了一个代理变量以激活服务。
In line 11, you declare a proxy variable to use to invoke the service.
匿名函数通常通过分配到一个代理变量，来在其他函数的上下文中定义。
An anonymous function is defined within the context of another function, usually by assigning it to a delegate variable.
研究结果认为，每日交易量作为每日信息到达时刻的代理变量对于中国股票市场每日收益的条件波动的解释力度不显著。
We find that daily trading volume, used as a proxy for information arrival time, has no significant explanatory power on the conditional volatility of daily returns.
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