Preliminary estimates put the number of birds'nests there at over 20000. 初步估計那裡的鳥窩有兩萬多個。
We can make a preliminary assessment of the impact that these new policies have had, and draw a comparison with previous policies. 我們可以對那些新政策的影響做個初步估計,然後再與之前的政策做個對比分析。