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RESULTS: The age of disease and age of menarche of BPBC patients were significantly younger than those of UPBC patients(P<0.05). 结果：双侧乳腺癌组发病年龄及初潮年龄均比单侧乳腺癌组早，且有显著性差异(P<0.;05)。
Today, the average age of menarche in the United States is 12.6 among white girls, 12.1 for black girls and 12.2 for Mexican-American girls. 今天，月经的平均年龄在美国白人女孩是12.;6岁，黑人女孩是12
Objective To investigate the effect of the age of menarche on bone shape and bone mass in female college students in Northern Jiaotong University. 目的：探讨月经初潮早晚对女大学生骨骼生长发育与骨量的影响。
Objective To evaluate the relationship of age,menopausal period,age of menarche,parity and lactation and bone mineral density(BMD). 目的探讨绝经后妇女年龄、绝经年限、初潮年龄、生育次数及哺乳时间与桡骨远端超声骨密度的关系。
Abstract: Objective To evaluate the relationship of age, menopausal period, age of menarche, parity and lactation and bone mineral density (BMD). 目的探讨绝经后妇女年龄、绝经年限、初潮年龄、生育次数及哺乳时间与桡骨远端超声骨密度的关系。
The result shows that age,occupation .contraceptive wags,induced abortion and parity have importam effect on the pathogenic mechanism of cervix erosion,apart from age of menarche. 从流行病学的角度,探讨了年龄、职业、避孕方式、初潮年龄、人流次数、产次与宫颈糜烂的关系。
For girls, the majority of the variance for the presence of menarche (88%) was explained by shared environmental factors, while that for age of menarche (73%) was by genetic factors. 女性初经有88%25可被共享环境因子所解释，而女性初经年龄则有73%25的变异受到线性遗传因子的影响。
The average age of the boys in this class is fifteen. 本班男生的平均年龄是十五岁。
I don't think he looks his age of seventy. 我感到他看起来不像70岁的人。
The age of majority is eighteen. 成年的法定年龄是18岁。
He ran away from home at the age of thirteen. 他十三岁那年就离家出走了。
At the age of thirty, Mary began to lose colour. 玛丽在30岁的年纪就红颜渐逝了。
She was orphaned at the age of ten. 她在十岁时成为孤儿。
My father retired at the age of 60. 我父亲六十岁时退休了。
My grandmother got married at the age of seventeen. 我的祖母十七岁就结婚了。
A STUDY OF MENARCHE AGE OF THE FEMALE UNDERGRADUATE STUDENTS IN SICHUAN 四川地区汉族女大学生月经初潮年龄的调查
He was already balding at the age of 25. 他25岁就秃顶了。
Cole popped off at the age of twenty. 科尔在二十岁时突然死去。
He lived to be [to the age of]80. 他一直活到了80岁。
The average age of the students is 19. 学生的平均年龄是19岁。