不仅风险预测站不住脚，而且即使是不用于群体而只用于个体，其误差之大以至于结果失去意义。
Not only is risk prediction unreliable but, when applied to individuals rather than groups, the margins of error are so high as to render any result meaningless.
由于各种原因，各测站的时间不能完全一致，导致轨道解算的误差。
Effected by various factors, the time at different observation station are not all coincide, which leads to errors in the setimation of orbits.
多路径误差在绝大部分应用中，其测站间相关性很弱，不能通过差分观测得到有效削弱，成为高精度GPS动态变形监测中的主要误差源。
Multipath error is a main influence on high-precision GPS dynamic deformation monitoring results as it is difficult to be mitigated by difference observation in most of applications.
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