名词
中文翻译：信件
同义词：
['letter', 'missive', 'correspondence']
例句：
-
1. He sent a letter to his sister last week.
他上周寄了一封信给他的姐姐。
-
2. She wrote a missive to her friend expressing her gratitude for their help.
她写了一封密信给她的朋友，表达对她帮助的感激之情。
-
3. They exchanged letters regularly during the war years.
他们在战争年代定期交换信件。