重点词汇
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书信
letter; epistle; communication; missive; correspondence; epistolary
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不断
continuously; unceasingly; incessantly; constantly; ceaselessly; unceasing; incessant; continuous; constant; uninterrupted; ceaseless; perpetual; unremitting
be in constant correspondence (with)
书信
letter; epistle; communication; missive; correspondence; epistolary
不断
continuously; unceasingly; incessantly; constantly; ceaselessly; unceasing; incessant; continuous; constant; uninterrupted; ceaseless; perpetual; unremitting