Prdc
abbr. Polar Research and Development Center <美>（陆军）极地研究发展中心
🗣️ 情景例句
It's about my grandfather.
是关于我爷爷。
He is supposed to be there on time.
按理说他应该准时到那儿。
but we found that it traced its way through the trees.
没想到它到树林中继续向前延伸。