监控理论由五个中心的假说和一些影响二语习得的因素组成，这些因素在很大程度上也影响着这些假说。

This theory consists of five central hypotheses and several factors which influence SLA and which is concerned with these hypotheses. Reading is always a problem during the second language learning.

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现在使用的一套五台设备是一起安装在架子上并放置在一个托管的数据中心里，每个月我都得付给这个中心占地费、电费、带宽费。

The current set of five are rack mounted in a co-location data centre, where I pay a monthly fee for space, electricity and bandwidth.

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