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All bimolecular reactions take place in a 3-dimensional(3D)space.Thus,it is critical to have a full stereo view of the bond breaking and forming processes in order to clearly understand the underlying reaction mechanism.Here,lists of practical experimental issues and data analysis procedures will first be discussed in great detail through various projection of 3D reaction attribute in a laser-aligned collision experiment.The measured polarization-dependent differential crossed section(PDDCS)is then used to fully characterize the correlation between the three vectors in a chemical reaction: reagent relative velocity,reagent rotational angular momentum and product recoil velocity.In combination with sliced imaging and crossed molecular beam technique,the proposed experimental strategy should be general and applicable to many other stereo-specific reaction studies.