B.R., a reader in Washington, DC who has just returned from a trip to Vietnam, sent us an image with a single line of explanation: "an unregulated telecoms infrastructure".

一位住在华盛顿特区的读者B.R.，最近刚去了一趟越南，他告诉我们有关越南的一个简单直白的印象：杂乱的电信设施。

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In the past week, plans for a manned lunar base, and a subsequent trip to Mars, were leaking from Washington, DC, almost as fast as air from the international space station.

上周，华盛顿特区透露了宁要建立—个'人类月球基地，然后登上火星的计划。这次透露几乎与国际太空站的空气—样快。

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Each two-week camp ends with a trip to Washington DC.

每个为期两周的露营活动结束于一次对华盛顿地区的施行。

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As the Wall Street Journal reported, a trip from Washington DC to Hartford, Connecticut may be far more expensive than a flight from DC to Barcelona, Spain, simply because airlines expect the DC to Hartford route to attract mostly business travellers.

BBC: How airline pricing works

Families and schools who can't make the trip to Washington, DC but want to participate in the festivities can enter the annual poster contest.

WHITEHOUSE: Our Top Stories

The school trip to a jail in Washington DC was intended as a cautionary lesson in what could happen if youngsters misbehaved and got into trouble with the police.

BBC: Jail trip pupils 'strip searched'