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Magnetic field is believed to play an important role in modern Astrophysics. Dust polarization is widely used to study magnetic fields in various astrophysical conditions by assuming that dust grains are magnetically aligned. Hence, the validation of this assumption becomes essential. In this talk, I will first demonstrate that dust polarization is indeed a reliable technique to trace magnetic fields in star-forming regions; then show one example of the role of magnetic fields inferred by the SOFIA/HAWC+ polarimetry observations in 30 Doradus, an active star formation region in the Large Magellanic Cloud.