Why do you think that the turnover rate is so high in some companies? Is there a problem with the company or those staff? If many staff is unhappy with the company, surely there must be a problem with the company right?

Anyway, the main thing here is that: DO NOT SIGN ANY BOND! I think some companies are quite jian. They make u sign a bond then let you can't leave the company. If you leave, you got to pay them a penalty. They can just survive earning money based on the penalty.