例如：Compared with DoD's plan, the options would yield greater improvemnets in reception and would yield improvements sooner.A theoretical framework is provided, consisting of negative reinforcing feedback loops that act as drivers behind future industry change.
a1：Our experimenntal data are not precise because the devices are in poor condition.（含糊）a2：Our experimenntal data are not precise because the devices are not working properly.（具体）b1:The results seem to be satisfactory.（含糊）b2:We are satisfied with the result that . （具体）
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