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。
Because of drawback of four-screen measuring system and two-screen velocity measuring method, an improved six-light-screen array is presented that is composed of six large area light screens.
弹丸着靶坐标和飞行速度以及飞行方向角是外弹道测试中必测参数，本文针对四幕光幕靶和双光幕测速系统的不足，采用六个大靶面光幕靶，构造出了两类六光幕阵列结构。
Because of drawback of four-screen measuring system and two-screen velocity measuring method, an improved six-light-screen array is presented that is composed of six large area light screens.
弹丸着靶坐标和飞行速度以及飞行方向角是外弹道测试中必测参数，本文针对四幕光幕靶和双光幕测速系统的不足，采用六个大靶面光幕靶，构造出了两类六光幕阵列结构。
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