They start as part of a headland or sea cliff connected to land. Smashing waves erode the softer rock, leaving harder rock behind in the form of sea stacks.
它们开始时作为岬角和海崖的一部分与陆地相连，海浪粉碎地侵蚀了较为脆弱的岩石，而把较硬的岩石留在所形成海栈的后面。
In a final pair of experiments, the scientists tested metaphors like "hard-hearted" and "she's a rock" by first having people touch either a wooden block or a soft blanket as part of a magic trick.
在最后一组实验中，科学家测试诸如“铁石心肠”、“她像块石头”这类比喻。首先，作为魔术的一部分，人们先是触摸一个木块或是一张柔软的毯子。
Up until my class began, I was under the impression that I would do a lot of climbing as part of my rock climbing class.
直到我的课程开始时我一直以为登高练习将会成为我课程内容的一部分。
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