名词
中文翻译：祖母的曾祖母
同义词：
["grandma's great-grandmother"]
例句：
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1.She is a step-grandmother to my sister, who is now in college.
她是我的姐姐的曾祖母，现在正在上大学。
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2.The family had a step-grandmother who helped raise the children.
这个家庭有一位曾祖母，帮助抚养了孩子们。
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3.When I visited her, she was surprised by my age and asked about my life.
我拜访她的时候，她惊讶于我的年龄，并询问了我的生活。