核心问题
at the playground 和 in the playground, 哪个说法正确?
词典解答
两个说法都是正确的。用 at 强调“地点”，用 in 强调“在……里边”：
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The students were all at the playground. 学生们都在操场上。
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The students were all in the playground. 学生们都在操场上。
at the playground 和 in the playground, 哪个说法正确?
两个说法都是正确的。用 at 强调“地点”，用 in 强调“在……里边”：
The students were all at the playground. 学生们都在操场上。
The students were all in the playground. 学生们都在操场上。