The wing has a two-spar structure and an active control surface for gust response alleviation.

该机翼具有双梁式结构和一个用于阵风响应减缓的主动控制面。

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Iceland SPAR is a form of calcite that splits light into two beams.

冰洲石是方解石的一种存在形式，它可以把光线分成两束。

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Pictured here: Two polar bears spar, or play fight, in Churchill, Manitoba.

图为两只北极熊在争吵或打闹，摄于马尼托巴丘吉尔。

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It has now been shown that it is of Iceland spar - a form of calcite known for its property of diffracting light into two separate rays.

BBC: 'Viking sunstone' found in shipwreck