With horizontal cloning, clones are defined on multiple machines in a system.
使用水平克隆时，在系统中的多台机器上定义克隆。
2
Perhaps it's because our visual system evolved to be overly sensitive to even slight departures from the horizontal, to help keep us upright.
可能是由于视觉系统进化，使得我们对些微高于水平面的物体过度敏感，以此帮助我们挺直腰杆。
3
These requirements include system audit and control, extensibility, resilience, vertical and horizontal scalability, multisite issues, and integration of third-party tools.