名词
中文翻译：订婚
同义词：
['engagement', "marriage例句：1. They've been engaged for three years now.（他们已经订婚三年了。）"]
例句：
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1. They've been engaged for three years now.
他们已经订婚三年了。
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2.The engagement party was a huge success.
订婚派对非常成功。
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3. He proposed to her at the engagement party.
他在订婚派对上向她求婚。