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She is writing a letter to a friend of hers, inviting him to attend the party.
她正在给她的一个朋友写信，邀请他参加派对。
youdao
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When Beth is writing a letter, she looks thoughtful.
当贝思写信时，她看上去像在沉思。
youdao
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When Beth is writing a letter, she looks thoughtful.
当贝思写信时，她看上去像在沉思。
youdao