Because the birds coast on the vortices created by the ultra-light craft, the tr

游客2024-12-21 1

问题 Because the birds coast on the vortices created by the ultra-light craft, the trip can only work in calm air at the sunrise.

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答案 the(sunrise)一／

解析 at sunrise是固定搭配，表示“日出时”，不用定冠词。类似的表示时间的名词还有sunset，noon，night，daybreak，dusk，dawn，midnight。

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