Frequent use of infomediary services leaves traces of information describing changing consumer behavior 资讯中介因而可以通过买家使用其服务，得到有关消费行为的资料。
2.
Leaf gap ( lacuna ) a region of parenchyma differentiated in the stem vascular cylinder immediately above a diverging leaf trace . lateral connections insure no break in the vascular system 叶隙：叶迹从中柱分出的上方，初生维管柱上方出现的一些薄壁组织细胞，与茎的维管柱结构不同，它的侧向连接保证了茎叶维管系统的连续。
