获取指定的父元素，然后找到指定的子元素

I have this HTML structure

我有这个HTML结构

<div class="parent_wrapper">
    <div class="child_element_one">
    </div>
    <div class="child_element_two">
        <p></p>
    </div>
    <div class="child_element_three">
        <a href="/go.html?url=#">Click to test</a>
    </div>
<div