Preliminary estimates put the number of birds'nests there at over 20000. 初步估计那里的鸟窝有两万多个。
We can make a preliminary assessment of the impact that these new policies have had, and draw a comparison with previous policies. 我们可以对那些新政策的影响做个初步估计，然后再与之前的政策做个对比分析。
