There is no knowingðɛəiznəuˈnəʊɪŋ短语¹³¹⁶²⁰⁺³ 基本例句 没法知道 Firstly, that carbon capture and sequestration technologies are extremely important but still not advanced, and there is no knowing when they will be ready to implement; 第一，碳的捕捉和封存技术很重要，但是目前还不成熟，什么时候成熟还是个未知数； chinadialogue