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the entry of molten rock into the gap ,

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the entry of molten rock into the gap ,
rather than the cracking of the crust,is responsible for segmentation of continentaldrifts.
plants and animals often use color to attract attention.the substances responsible for these
colors belong to a class of chemicals known as antioxidants{抗氧化剂}
翻译 并详细解释两句中responsible for 的用法
the entry of molten rock into the gap ,
这不只“产生”了地壳的裂缝, 同时也“导致”了大陆漂移的发生.
植物和动物经常使用颜色吸引来注意.“产生”这些颜色的物质属于一类化学物质,它们被称为抗氧化剂.(引号内为be responsible for 的解释,试着联系上下文理解,切勿脱离具体语境)