你不必给他写信
You don't have to write to him
以上为机器翻译结果，长、整句建议使用 人工翻译 。
你不必给他写信，你可以打电话给他。
You don't have to write him. You can telephone him instead.
youdao
你不必给他写信。
You need not write to him.
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