expection期待expectv.预期；期待；盼望expected day of ovulation预计排卵期expected opportunity cost预期性机会成本expected discotmted value期望折现expected marginal revenue期望边际价值Expected Date of Shipment预计装运日期expected opportunity loss预期机会损失Expected Time of Response预期响应时间expecting simple variable期望简单变量expected profit insurance预期利润保险expected Nash equilibrium期望值Nash均衡