Prdc
abbr. Polar Research and Development Center <美>（陆军）极地研究发展中心
🗣️ 情景例句
Challenge, the feeling of accomplishment, and knowing that you have made a contribution.
挑战，成就感和知道自己做出了贡献。
There is no general rule without some exception.
普遍规律必有例外。
They were all hungry and the food smelled good.
他们全都饿了，饭菜散发出阵阵香味。