The shortwave communications is indispensability required in certain field and situation, and its security has always been a widespread concern.
短波通信在某些场合是不可替代的，其安全问题一直为人们所关注。
The shortwave communications is indispensability required in certain field and situation, and its security has always been a widespread concern.
短波通信在某些场合是不可替代的，其安全问题一直为人们所关注。
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