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This focusing is the main reason that even relatively weak sounds in the ocean, especially low-frequency ones, can often travel thousands of miles.

正是由于这种集声，即使是海洋中相对微弱的声音，尤其是低频声音，也能传播数千英里。

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Authorities say thousands of people remain stranded in villages with food and fuel running low.

VOA: standard.2010.08.02

Most enhanced e-books sell in the low thousands, according to publishers.

WSJ: Enhanced E-Books: Blowing Up the Book

Norris says that Dead Social is signing up about 40 new users per day, but that none of their low-thousands of users have kicked the bucket yet.

FORBES: Social Network Of The Living Dead

The heightened tensions comes amid an unprecedented strike by thousands of low-ranking police across Egypt.

BBC: Egypt police withdraw from Port Said