点对点托福背景知识-TOP14L3 How did Polynesian way

obstacle : a thing that blocks one's way or prevents or hinders progress

double-hullede canoe

ocean swell

the lagoons of pacific atolls 这里是不是下面的实时字幕有问题？但是 不应该是 哎的音么 等待好心人解答

unfathomably adj 深不可测的

vibrant