Through its placenta, the fetus pumps the mother’s arteries with hormones that keep them open to provide a permanent flow of nutrient-rich blood. 想請問這句話中的that 子句是 hormones that keep them open嗎？是用來修飾hormones 荷爾蒙嗎？謝謝～～～ ----- Sent from JPTT on my iPhone --

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