在我国有必要建立侦查人员出庭作证制度。
In our country there is a need for investigators to testify in court system.
证人出庭作证制度是证人制度的核心问题。
The system of the witness 'testimony at court is the core of witness system.
警察作证是推进证人出庭作证制度完善的重要一环。
Police testimony is an important step for promoting the perfection of institution of appearing in court as a witness.
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