You have a vague sense of guilt that you aren't paying close attention, but you tell yourself that any material you miss can be picked up from a friend's notes.

你隐隐有些罪恶感，觉得自己没有集中注意力，但是你安慰自己说，所有错过的材料都可以借朋友的笔记补回来。

The Ukrainian soldiers apparently picked up the material so quickly that they were given more instruction than originally planned the individuals training in the U.S. were handpicked by Ukrainian military leaders.

显然，乌克兰士兵很快就学会了这些材料，他们得到了比原计划更多的指导。在美国接受训练的个人是由乌克兰军事领导人亲自挑选的。