BSD可能是或者不是您合适的选择，但是不要仅因为您对其他的系统比较熟悉而忽视它。
BSD might or might not be the right choice for you, but don't make the mistake of overlooking it just because you're familiar with something else.
因此，如果空谈物理模型而忽视它的使用条件和使用范围，往往导致荒唐的结论。
When using a model, we should always note how it is abstracted from object.
[摘要]目前，人们过于关注PPP模式的优点，而忽视它的缺点以及优点的发挥需要的基础环境条件。
Abstract: Now, the merits of PPP are paid close attention to, but its shortcomings and the foundation environmental conditions which the merit display needs are neglected.
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