依照法庭审判程序，辩护律师只有在法庭调查、辩论两阶段，才能充分发挥辩护作用，保护被告人的合法权益。法庭辩论中必须引用经法庭调查核实的事实和证据，不得引用未经法庭调查的材料。所以，庭审进入调查阶段，辩护律师主要是通过向被告人、证人、鉴定人发问，当法庭查明有 According to the court trial procedure, the defense lawyer can give full play to his defense function and protect the legal rights and interests of the defendant only when the court investigates and debates the two stages. The court debate must include facts and evidence that have been verified by the court investigation and must not cite materials that have not been investigated by the court. Therefore, the trial entered the investigation stage, defense lawyers mainly by asking the defendant, witness, expert, when the court found that there is