求英语大神帮我看看这几句话怎么理解

求英语大神帮我看看这几句话怎么理解1、In contrast,some systems require the located object to periodically broadcast,respond with,or otherwise emit telemetry to allow the external infrastructure to locate it.The infrastructure can \x0cnd objects in its purview without directly involving the objects in the computation.Personal-badge-location systems fit into this category,as do bar codes and the radio frequency identi\x0ccation tags that prevent merchandise theft,track shipments,and help identify livestock in the field.（这之前都是前文语境,后面两句是要翻译的）Placing the burden on the infrastructure decreases the computational and power demands on the objects being located,which makes many more applications possible due to lower costs and smaller form factors.The policy for manipulating location data need not be dictated by where the computation is performed.我最不清楚的地方主要在于which makes many more applications possible due to lower costs and smaller form factors这个从句.这个lower costs and smaller form factors是针对谁的?是说applications的功耗降低了?可是applications怎么还能有尺寸?还是针对objects being located说的?看起来也说不通啊?2、The second signal is swept rapidly through 360° like the light from a lighthouse at a rate such that the signals are in phase at magnetic north and 180\x0e° out of phase to the south.By measuring thephase shift,aircraft listening to a VOR station can compute their “radial," the compass angle formed by the direct vector to the VOR station and magnetic north,to 1°\x0e.Aircraft location can be computed via angulation using 2 VOR stations.VHF radio signals are limited to line-of-sight reception and the range of the transmitted signals is 40-130 nautical miles.主要是at a rate such that the signals are in phase at magnetic north and 180\x0e° out of phase to the south不太懂,感觉就跟句式不完整还缺了点儿什么似的.还有主要就是the compass angle formed by the direct vector to the VOR station and magnetic north,to 1°\x0e.