熟悉内幕的的英文：
in the know

know是什么意思：
v. 知道，了解，懂得；认识，熟悉；认出；体验；见到过，听到过

Learn not and know not
不学无术

Know/not know what is most important and act accordingly
能[不能]按轻重缓急行事

Do you know that lady?
你认识那位夫人吗？

Do you know the Hallelujah Chorus?
你知道哈利路亚合唱曲吗？

Few know and few care.
很少有人知道，也很少有人关心。