名词
中文翻译：未计划的电话
同义词：
['unplanned call', 'unannounced call']
例句：
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1.He received an unscheduled call from his boss last week.
他上周接到了老板一个未计划的电话。
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2. The unscheduled call interrupted our meeting.
那个未计划的电话打断了我们的会议。
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3. She was surprised to receive an unscheduled call from her friend.
她惊讶地接到了一个朋友的未计划电话。