重点讲解：
1. be addicted to
成瘾的，上瘾的；
eg. The children are addicted to computer games.
孩子们对计算机游戏上了瘾H&;iTEyqOdQ51^d&。
eg. After about three months, I was no longer addicted to nicotine.
大约3个月后，我就不再对尼古丁上瘾了R(ryWwzgt!N。
2. in theory
从理论上说；照理说；
eg. A school dental service exists in theory, but in practice, there are few dentists to work in them.
照理说，学校也有牙医诊所，可实际上，里面的牙医寥寥无几6q-wj1MJ%cJnb。
eg. It seems good in theory, but it doesn't work in practice.
理论上它似乎很不错,但实际上却行不通Tl.[+h76F_5Fl;y。
3. no kidding
（强调所说的是真实的或是认真的）真的，不是开玩笑；
eg. I'm scared. No kidding, really.
我很害怕Pob+P+yBv2PHr。不是开玩笑，真的T#(MZqyz]C_jmXreMeC。
eg. No, no kidding. I am serious.
没有开玩笑，我很严肃z|Xmau@()9l^。