1、
The amplitude of P-VEP is very small and it is easily interfered by electrocardio and myoelectric.
但是动物P-VEP信号的振幅很小，极易受到心电、肌电的干扰而难于记录。
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2、
3、
NoSQL: One issue with the RDS server is that it is a relational database that is hard to scale.
NoSQL：与RDS服务器同样的问题就是它是一个难于扩展的关系数据库。
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