黄宗羲、顾炎武、王夫之等人的思想体系具有时代特色。这个”时代”是指

下列实验操作或做法能实现目的是（　　）

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阅读《钱塘湖春行》回答下面的问题。

                                                                                                                                 钱塘湖春行

                                                                                                                                唐  白居易

                                                                                                            孤山寺北贾亭西，水面初平云脚低。

                                                                                                           几处早莺争暖树，谁家新燕啄春泥。

                                                                                                           乱花渐欲迷人眼，浅草才能没马蹄。

                                                                                                           最爱湖东行不足，绿杨阴里白沙堤。