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

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

admin2013-06-12  90
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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