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Microinjection-compression molding (μ-ICM) is a promising technique for replicating microscale parts for various miniaturized systems. In the work on page 358 by Wei-Sheng Guan, Han-Xiong Huang, and Bin Wang, the isotactic polypropylene micropart with hierarchical crystalline morphology is prepared by μ-ICM, which involves intensive Poiseuille and squeeze flows occurring in the injection and compression stages, respectively. A close relationship is demonstrated between the shear/elongational strain rates and the crystalline structure, based on which a useful route to manipulate the crystalline structure via varying the compression-related parameters is proposed.