Certificate of necessity
[經] 必要證書
?? 詞語組成解析
certificate
[s?'t?f?k?t]
n. 證明書;文憑，結業證書;
vt. 發給證明書;用證書證明（或認可）;
cert 搞清 + ifi=fy表動詞 + cate表名詞 → certify搞清楚=證明+ cate表名詞 → 證件
of
[?v]
prep. 關于;屬于…的;由…制成;
aux. 助動詞 [非標準用語、方言] =have [主用于虛擬語氣];
??? 情景例句
And then branched out into other sports products.
然后逐漸擴展出其他的運動產品。
The still sow eats up all the draff.
不聲不響的豬吃光全部的飼料。
Country people run wild when they go shopping in the city and stagger home loaded with as many of the exotic items as they can carry.
鄉里人進城采購欣喜若狂，每次回家時都買足了外來商品，直到拿不動方才罷休，連走路都搖搖晃晃的。