glean
verb [ T ] uk/ɡliːn/ us/ɡliːn/
缓慢艰难地收集（信息）
to collect information in small amounts and often with difficulty
From what I was able to glean, the news isn't good. 从我费劲收集到的信息来看，情况不妙。
They're leaving on Tuesday - I managed to glean that much (from them). 他们将在星期二离开——我费了很大劲儿（从他们那儿）打探到的就这些。