英语语法分析

Objective To observe the clinical effect of calcium supplement on women at perimenopause.

目的观察妇女在围绝经期补钙的临床效果。

Objective:To offer the references for selecting and preparing animal models of perimenopause.

目的：为围绝经期疾病的动物模型的选择和制备提供参考。

This continues until perimenopause - the time when a woman's body begins the natural transition to menopause.

这个过程循环持续到停经前期——在该段时间里，女性身体开始自然过渡到绝经期。