500 khz : this is an international ship calling and distress frequency for maritime communications in morse code 500千赫:这是一艘国际船要求和求救频率海通信在摩尔斯电码。
2.
From the british perspective , the long arm of american regulation has reached across the atlantic with distressing frequency lately 英国认为，显然美国的过度规制以横跨大西洋，影响到了本国利益。
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