Dmd
abbr. （拉）牙科学博士（Dentariae Medicinae Doctor, 等于Doctor of Dental Medicine）；数字微镜器件（Digital Mirror Device）
🗣️ 情景例句
No, he never did.
没有， 从来没有。
To worry
烦恼，担心
and these will ply the short wings with such irresistible power that they can bore for long distances through an opposing gale before exhaustion follows.
这些肌肉以巨大的力量扇动短小的翅膀，使这类鸟能顶着大风飞行很远的路才会疲劳。