The controls of most modern airplanes can be operated either manually or automatically.
A、bythebookD
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The first paper was made from the bark of the mulberry tree.
Peoplewhodonotsleepenoughtendtobecomeirritable.
Some animals pant and sweat to speed evaporation of body moisture and thus cool themselves.
TheNativeAmericaninterpreterSacajaweawasavaluablememberoftheLewisanddarkexpeditionin1805.
Some children display an unquenchable 难以抑制的 curiosity about every new thing they encounter.
