阅读下面这首古诗，回答以下两题。
                                                                                                            夏 意（苏舜钦）
                                                                                                           别院深深夏席清，
                                                                                                           石榴开遍透窗明。
                                                                                                           树阴满地日当午，
                                                                                                           梦觉流莺时一声。
                                                                                             注：别院，即正院旁侧的小院。

词语解释：

①脱口说出

②撤退

动脉血是指（    ）的血液．