The whole apparatus is enclosed by vacuum insulation layer, magnetic fluid sealer and disc cover and supported on the machine base.
整个装置由真空保温层、磁流体密封器、圆盘状盖封闭，支承于机座上。
An annular eclipse occurs when the moon does not cover the entire disc of the sun so that a ring of light encircles the shadow of the moon.
当月亮不能完全遮住太阳时，月亮影子的周围就会有一圈亮光，日环食就发生了。
Before reassembling cover to gear operator, make sure disc is approximately 30 degrees away from full open position.
在把盖子重新安装在齿轮执行机构上之前，确认阀瓣位于全开位置处30度的地方。
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