重点讲解：
1. be into sth. 对…很感兴趣；极喜欢；
例句：I'm into electronics myself.
我本身对电子很感兴趣DQ^&(%#bmzIvhFcI。
2. keep up 了解；熟悉；
例句：It depends on how hard the two teams push themselves today. But we are able to keep up with the pace of any opponent. That will help us.
这要看两队今天的努力程度，我们会跟上对手的比赛节奏Hcx@jI1*4wBIj。
3. spy on 秘密监视；
例句：They can spy on me through a window.
他们通过一扇窗户可以监视我sY-b+IX*wLu7Y#8M,。
4. find out (尤指特意通过努力)发现，找出，查明；
例句：The company is trying to find out the source of information divulged.
公司正努力寻找泄露消息的来源[SWt!@KG_aCDYAF。