Ac.
[医] 锕(89号元素)
🗣️ 情景例句
Richard tells me you're a doctor.
Richard告诉我您是医生。
There are ten dimes in every dollar.
每美元有十角。
Yet a great many processes depending on such research are sought for with complete secrecy until the stage at which patents can be taken out.
然而，依赖这种研究的很多工艺程序是在完全保密的情况下进行的，直到可以取得专利权的阶段为止。