Teacher: What are the four element of nature?

老师：自然界的四大元素是什么？

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To satisfy the need of hardware-in-the-loop simulation of four-element infrared seeker, a method of dynamic infrared scene generation based on "direct signal injection" was proposed.

针对四元红外导引头半实物仿真任务的需要，提出基于“直接信号注入”的动态红外场景生成技术。

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Based on the four-element model, the equation of the stress relaxation process is developed using the principle of Boltgation superposition in this paper.

以四元件模型为基础，利用玻尔兹曼叠加原理建立了纱线应力松弛变化过程的理论方程，并分别对彩棉喷气涡流纺及环锭纺纱线进行松弛实验。

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Hertz has a pair of charging stations at Connect offices in Manhattan, and is partnering with Starwood Hotels, which is installing stations at the snazzy new Element Times Square hotel, and soon at other Starwood Aloft, Element and Four Points by Sheraton hotels.

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Twenty feet wide, it is the building's organizing element and circulation spine, connecting the first four floors and continuing upward with bridges across the space and a narrower stair above as it ascends to the structure's full nine-story height.

WSJ: Cooper Union's New Building, at 41 Cooper Square | By WSJ Architecture Critic Ada Louis Huxtable

The element of relative scarcity in the economy over the last four years has given rise to much more intense competition.

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