distress frequency 是什么意思

	【无线电】遇险求救频率。

	distress: n. 1.苦恼，烦恼；悲痛，悲叹；使人悲痛[苦恼]的事情 ...
	frequency: n. 1.屡次，频仍，频繁。 2.(脉搏等的)次数，出现 ...

	1.	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。

distress frequency是什么意思