div内有多行内容，且内容大致是按照左中右结构排列的情况，且父级高度有限制，子元素不限制。

<div style="width: 100%; height: 175px;display: flex; justify-content: space-around;color: #c7fffb;font-size: 24px;">
              <div style="display: flex; justify-content: center; flex-direction: column; align-items: center; vertical-align: middle">
                <div>容量：<span>0.62MW</span></div>
                <div>总投资：<span>338万元</span></div>
              </div>
              <div style="display: flex; justify-content: center; align-items: center; flex-direction: column; vertical-align: middle">
                <div>总发电量：<span>148千万kW.h</span></div>
                <div>总发电收入：<span>116千万元</span></div>
              </div>
              <div style="display: flex; justify-content: center; align-items: center; flex-direction: column; vertical-align: middle">
                <div>平均发电量：<span>509万kW.h</span></div>
                <div>平均发电收入：<span>460万元</span></div>
              </div>
</div>

效果：

div中所有元素上下居中对齐（父级高度有限制，子元素不限制）_html