Then the class begins in earnest with four screen regions defined in the layout element: one for the presenter in overview, one for the score, and two more for the left and right hands.
然后课程开始使用在 layout 元素中定义的四个屏幕区域：一个用于演示者概述，一个用于显示乐谱，另外两个分别用于显示左手和右手。
Two models - radiant wire screen or radiant ceramic element. Can be manifolded to provide a large radiant panel. Suitable for numerous industrial drying and heating applications.
两个系列供选：辐射金属丝网，辐射陶瓷元件。可以设计为大型辐射屏，适合众多的工业烘干和加热应用。
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