preliminary estimate的用法和樣例：
例句
- Preliminary estimates put the number of birds'nests there at over 20000.
初步估計那里的鳥(niǎo)窩有兩萬(wàn)多個(gè)。 - 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(gè)初步估計，然后再與之前的政策做個(gè)對比分析。
