6.俗话说：吃一堑，长一智。
As the saying goes: one learns from his past mistakes.
7.雅思考高分，准备要充分。没听说嘛，工夫不负有心人。
To score high on IELTS, one needs to make full preparations. As it is often said: if you keep trying, you’ll finally succeed.
8.才能学好英语?先买本好词典，这就叫作“公欲善其事，必先利其器”。
How can we learn English well? I would say that you need to have a good dictionary in the first place. As the a Chinese saying goes: If you hope to do a good job, you need to be fully prepared for it.
