重点讲解：
1. in reality
事实上；实际上；
eg. He came across as streetwise, but in reality he was not.
他给人的印象是很适应都市生活，但实际上并非如此。
eg. Outwardly she looked confident but in reality she felt extremely nervous.
表面上她显得很自信，其实她非常紧张。
2. for real
真实地；真正地；不是假装；
eg. This isn't a practice game; we're playing for real.
这可不是练习；我们是在认真地比赛。
eg. I don't think her tears were for real.
我认为她的眼泪不是真的。
3. out of the blue
突然；出乎意料地；
eg. One of them wrote to us out of the blue several years later.
数年后他们中的一人突然给我们写了一封信。
eg. The news was a great shock to me; it came absolutely out of the blue.
这个消息，对我是一个很大的打击，简直太突如其来了。
4. go about
文中是【航】掉转船头的意思；
eg. The captain ordered them to go about.
船长命令他们调转船头。
eg. As soon as he heard the cry "man overboard", he ordered the ship to go about and search for the missing man.
他一听到有人喊“有人落海”，他立即下令船转向，搜寻失踪的人。