名词
中文翻译：信封线
同义词：
['envelope line', 'envelope margin', 'envelope edge']
例句：
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1. The envelopeline is the border around the letter.
信封线是信纸边缘的线条。
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2.The envelope line was used to seal the envelope.
信封线用于密封信封。
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3. The envelope line is important for keeping the letter secure.
信封线对于保持信件安全至关重要。