Deuterated
a. 含重氢的
🗣️ 情景例句
What a thoughtful boy he is!
他是个多么体贴的男孩啊!
To send mail(a letter)
邮寄邮件
Alpine village tended to be impoverished settlements cut off from civilization by the high mountains.
阿尔卑斯山山区的小村几乎全是高山环抱、与世隔绝的穷乡僻壤。