I must take issue with your over what you said at the meeting.
我要和你好好谈谈你在会上说的那些话。(take issue with someone: 对某人的观点提出异议。)
Finding planets is proving hard enough, but finding life on them will prove infinitely more difficult.
寻找行星证明相当困难,但是要在行星上发现生命会变得无比艰难。