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。

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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。

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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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The haters came on early and strong for this venturesome tri-level seafood shack in Red Hook.

NEWYORKER: Brooklyn Crab

Their performance let to demands from fans around the world that the South Americans, who do not have regular high-level competition, be included in either the Six Nations or the Tri-Nations as soon as possible.

BBC: CHOOSE A SPORT

Developed by researchers at RIKEN and Tokai Rubber Industries (TRI), the new robot can lift a patient up to 80kg in weight off floor-level bedding and into a wheelchair, freeing care facility personnel of one of their most difficult and energy-consuming tasks.

ENGADGET: RIBA-II healthcare robot now stronger, smarter -- still a bear