Swiper 官网例子中用的MD-CARD是什么

Question

究竟是个什么？给个关键词<template>  <md-card>    <md-card-actions>      <div class="md-subhead">        <span>Default</span>        <span>（</span>        <span>默认设置</span>        <span>）</span>      </div>      <md-button class="md-icon-button"                 target="_blank"                 href="https://github.com/surmon-china/vue-awesome-swiper/blob/master/examples/01-default.vue">        <md-icon>code</md-icon>      </md-button>    </md-card-actions>    <md-card-media>      <!-- swiper -->      <swiper>        <swiper-slide>Slide 1</swiper-slide>        <swiper-slide>Slide 2</swiper-slide>        <swiper-slide>Slide 3</swiper-slide>        <swiper-slide>Slide 4</swiper-slide>        <swiper-slide>Slide 5</swiper-slide>        <swiper-slide>Slide 6</swiper-slide>        <swiper-slide>Slide 7</swiper-slide>        <swiper-slide>Slide 8</swiper-slide>        <swiper-slide>Slide 9</swiper-slide>        <swiper-slide>Slide 10</swiper-slide>      </swiper>    </md-card-media>  </md-card></template>