求翻译：土壤湿度测试仪主要是由湿度传感器和单片机构成的测试系统。该测试系统是通过湿度传感器，对土壤的湿度进行测试，并利用电压跟随器输入阻抗高、输出阻抗低的特点，将电压跟随器作为信号采集和处理之间的缓冲级，“隔离”了前后级之间的影响，使采集的信号不衰减的传输到负载；再经过由A/D采集信号送给单片机处理，能通过程序计算出所测土壤的具体湿度，并用液晶显示器直接显示出来。是什么意思？

Soil moisture tester consisting mainly of the humidity sensor and single-chip microcomputer test system. The test system is through humidity sensor, on soil of humidity for test, and using voltage follow Manager entered impedance high, and output impedance low of features, will voltage follow Manager as signal collection and processing Zhijian of buffer level, "isolation" has before and after level Zhijian of effect, makes collection of signal not attenuation of transmission to load; then after by A/D collection signal to single tablets machine processing, can through program calculation out by measuring soil of specific humidity, and LCD monitor directly display out.