For example, you can try to measure how hard it is to spin this sheetof paper about an axis that is in the center of it.
比如，试着让一张纸绕其中心轴旋转，看看有多困难。
2
When you drag and drop the HTTP Methods activity from the palette, its property sheet will display the list of REST services and feeds that are registered in the IBM Mashup Center.
在从面板拖放此 HTTP Methods 动作后，其 property 表将会显示在 IBM Mashup Center 内注册的 REST 服务和提要的列表。
3
Armstrong signed the flight plan sheet and gave it to the head of NASA's public information office while he was quarantined at the Johnson Space Center after returning to Earth.