她匆匆写了个便条告诉妈妈她已外出。She scribbled a note to tell Mum she'dgone out.他把便条递给了桌旁的女孩。He gave the girl at the desk the message.史蒂文斯给他写了张便条，请他去自己的公寓。Stevens wrote him a note asking him to come to his apartment....
The technology uses an electrochemical process to produce electricity.这种技术利用电气化学反应发电。Correspondingly, any complete electrochemical cell can be separated into two hypothetical half - cells.同样, 任一完整的化学电池也可分为两个假设的半电池.Black ...