engagement letter

例句：

1. 3.
   与某人
2. 1. He proposed to her at the engagement party.
   他在订婚派对上向她求婚。
3. 2. They have made an engagement to meet on Saturday.
   他们已约定周六见面。
4. 3. The couple has engaged in a long-term relationship for several years.
   这对夫妇已经订婚并交往了好几年。