The Billiard-Ball Model has been used to discuss the formation of Two-photon Tri-level Echo.
本文用弹球模型讨论了双光子三能级光子回波的形成。
The development and research of tri-level inverter in the field of high-voltage and large-power have received much attention these years.
近年来在高压大功率领域三电平变频器的开发研究得到了广泛关注。
Therefore we should establish a tri-dimensional and dynamic new bookbinding concept that can make the bookbinding art go up to a new level.
因此，我们应该确立三维视觉概念的、立体的、动态的书籍装帧设计观，使书籍装帧艺术上升到一个新的层次。
Therefore we should establish a tri-dimensional and dynamic new bookbinding concept that can make the bookbinding art go up to a new level.
因此，我们应该确立三维视觉概念的、立体的、动态的书籍装帧设计观，使书籍装帧艺术上升到一个新的层次。
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