De morgan's theorem
[计] 德摩根定律
🧩 词语组成解析
[化] 非对映体过量\\n[医] 铥(69号元素铥的别名,1916年Eder离得的假想元素)
🗣️ 情景例句
Don't worry, Richard.
别担心， Richard。
Did you go to the concert yesterday?
你昨天去听音乐会了吗？
but more often than not, the greater part of the journey is spent on roads with few service stations and too much traffic.
但旅行的大部分时间都花在路上，而且只有很少的服务设施，交通也很拥挤。