重点讲解：
1. be responsible for 负有责任的；应承担责任的；
The teacher is not responsible for the student's success or failure. They are only there to help the student learn.
教师对学生的成败并不负有责任，其职责只是帮助学生学习2+x)ZQ*Rrm5_q&。
2. so far 迄今为止；到目前为止；
There's been no comment so far from police about the allegations.
到目前为止，警方对这些指控还没有发表任何评论c-*I7k[s)3vgO5L。
3. pull out of 退出，撤出（协议、比赛或组织）；
David had to pull out of the Championships when his horse went lame.
戴维不得不退出锦标赛，因为他的马瘸了+T=NTLiuRhdR。
4. encourage sb. to do sth. 鼓励；激励；
We want to encourage people to go fishing, not put them off.
我们希望鼓励人们去垂钓，而不是打消他们的热情-8D=HVo5-^。