The form of these aluminium-framed elements is determined by their position relative to the sun's trajectory and the surrounding buildings.

这些铝框元件的形状是由他们相对太阳轨迹和周围建筑的位置来决定的。

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The beam expanding system has some advantages of fewer lenses, simple structures and smoothly zoom trajectory, and it is suitable for simulating lighting elements with different sizes.

系统具有镜片少，结构简单，变焦轨迹平滑无卡滞等优点，可用于模拟不同尺寸的闪电单元。

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First, the optimization model of interplanetary low-thrust trajectory was established using modified equinoctial elements.

首先，基于归一化的改进春分点根数建立了星际小推力转移轨道的优化模型；

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For such a particle, it is possible to work out its velocity (from the time taken to pass between the two layers) and its trajectory (from the relative positions of the elements triggered in each sensor layer).

ECONOMIST: Orbital debris