重点讲解：
1. play on 利用（恐惧、弱点或过失）；
Advertisements often play on people's fears.
广告常利用人们的恐惧心理_ioonw8y^5Sx#w[0y。
2. cover up 隐藏，遮掩(事实)；
Irene's cleaning the floor had been a calculated attempt to cover up her crime.
艾琳擦洗地板就是为了蓄意掩盖她的罪行*RES83Cl^.;YV);.dl。
3. spy on 秘密监视；
They're using villagers to keep an eye on each other, to spy on each other.
他们利用村民互相监视，互相窥探lThpsO9ZFhei6&。
4. under fire 遭到猛烈批评；受到强烈抨击；
The traditional two-year MBA degree is under fire as many leading schools look to make the degree more flexible.
就在传统的两年制MBA课程遭受诟病之时，许多一流商学院开始着手赋予课程更大的灵活性Y+~geLgcp]2n[fImA。