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Face masks pose an additional barrier to effective communication that primarily impacts spectral characteristics, vowel space measures, and vocal effort. Future work should evaluate how long-term mask use impacts vocal health and may contribute to vocal problems. 3 Laryngoscope, 2021. 3 Laryngoscope, 2021.In recent years, sweet potato has been cultivated not only in marginal lands but also in fertile plains in northern China. The fertile nitrogen (N)-rich soil may inhibit storage root formation. Cultivars with different N tolerances an
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