Pj
abbr. 有功电度表；圆周喷射（Peripheral Jet）
🗣️ 情景例句
I'll try to explain.
我会尽量给你解释。
It's been cloudy all morning.
整个早上多云。
Libraries made education possible, and education in its turn added to libraries: the growth of knowledge followed a kind of compound interest law, which was greatly enhanced by the invention of printing.
藏书使教育成为可能，而教育反过来又丰富了藏书，因为知识的增长遵循着一种“滚雪球”的规律。印刷术的发明又大大提高了知识增长的速度。