From outside, the 2, 711 dark gray slabs form a gentle wave, ankle-high in some places, designed to give visitors a sense of instability, a loss of orientation.

从外观来看，纪念碑群由2711根长短不一的灰色碑柱组成，从远处望去，黑灰色的石碑如同一片波涛起伏的石林，让游客不由自主产生一种不稳定的、迷失方向的感觉。

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Based on the characteristics of nonlinear negative index materials, we investigate the formation conditions and transmission characteristics of the chirped dark solitary wave in detail.

结合负折射介质的特性，详细研究了该啁啾暗孤波的形成条件和传输特性。

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Next wave of evidences about the dark matters appeared in1970s of the 20th century.

有关暗物质的下一波证据则出现在20世纪70年代。

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Millions of people were left in the dark, with no power, no telephones, no internet, and no air-conditioning during the worst heat wave in years.

FORBES: The U.S. enters the 20th century: why we can't keep the electricity on