New: enable viewer-created translations and captions on your YouTube channel!
视频中提到的知识:
加减法
数轴
正数与负数
Use the following code to embed this video. See our usage guide for more details on embedding.
Paste this in your document somewhere (closest to the closing body tag is preferable):
<script type="text/javascript" src='https://amara.org/embedder-iframe'></script>
Paste this inside your HTML body, where you want to include the widget:
<div class="amara-embed" data-url="http://www.youtube.com/watch?v=fFdOr8U4mnI" data-team="null"></div>