能量供应和带宽的限制成为制约移动设备的基本因素。
The fundamental constraint for mobile devices is limitations because of energy supply and bandwidth.
制约学生在初中后继续接受教育的重要因素有两个，一是社会经济状况，二是场地限制。
The two main determining factors that greatly affect a student"s prospects for an education beyond primary school are socio-economics and availability of places.
尼泊尔很多地区存在着严重的资源制约因素和不利的地形条件，这些不利因素限制了人们使用医疗设施的能力。
Severe resource constraints and difficult terrain limit access to health-care facilities in many parts of Nepal.
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