Holes were cut into the hulls to sink the vessels and they were then filled with sediment, mostly mud, to weigh them down and secure them.
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He makes "feel-good music" and can "definitely" make a career from it, she believes.
需要元素值:栈存值,或答案存索引后用 nums[res[i]] 取值。
Rebecca Morelle, Alison Francis and Greg BrosnanBBC Science