1.想想我们学习英语的漫漫之路和我们对英语掌握的程度，应该说我们的投入与产出比太低了。
When we think about the long process of our English study and the level of our mastery of this language that we have reached, we should say that the input and output ratio is too low.
2.如今，很多电视节目里充斥着暴力镜头，这对人们，特别是青少年的日常行为，造成了极为不利的影响。
Nowadays, there are simply too much violence in TV programs and this is having an extremely negative influence on the daily behaviors of people, especially youngsters.
3.众所周知，青少年具有超强的模仿力，因此也就最容易受到影响。
As is known to all, youngsters tend to copy certain behaviors quickly, so they are the most easily affected group // vulnerable group.
