The report does not have to use a special format and single spacing is acceptable.

报告不要求有特别的格式，单倍行距也可。

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Single spacing is used within paragraphs, double spacing between paragraphs.

单倍行距用于段内，双倍行距用于段与段之间。

《柯林斯英汉双解大词典》

For each entry, use hanging indent and single-spacing.

每条引用条目，悬挂式缩进，单倍行距。

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For each entry, use hanging indent and single-spacing.

每条引用条目，悬挂式缩进，单倍行距。

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