Amy then found a strong, straight stick.
然后艾米找到了一根又硬又直的棍子。
Refraction makes a straight stick look bent if it is partly in water.
折射使一根部分浸在水中的直棍子看起来是弯的。
Find a straight stick and put it in the ground in a place where you can mark its shadow.
①找一个直棍，将其立在一个你可以标记它的影子的地方。
Find a straight stick and put it in the ground in a place where you can mark its shadow.
①找一个直棍，将其立在一个你可以标记它的影子的地方。
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