Much as hounds track the scent of their prey, the monocytes squeeze between endothelial cells and follow the chemical trail to the intima.

• 于是，单核球就好比追踪猎物气味的猎犬一般，从内皮细胞之间的缝隙挤身而过，顺著这些物质的踪迹进到内膜里头。