難しくなかったけど。。。

今日の授業は難しくなかったけど、全部わからなかったので、ちょっといらだたしかった。　全てを理解に慣れたから。　それに、今週はだけ復習だ。。。

it wasn't difficult, but...
today's classes (in third-level) weren't difficult, but because i didn't entirely understand (what was said), it was a little frustrating. （i'm accustomed to comprehending everything.) furthermore, this week is only review...