Risking his life, Joe jumped back into the cold water and managed to drag (拽) his dad up onto some rocks.
乔冒着生命危险跳回寒冷的水中,成功把他爸爸拖到一些岩石上。
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This means that as they head hundreds of feet up to the surface to feed each day, they're dragging along cold, nutrient-rich waters from the ocean deep, then pulling warmer streams back down.