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But several times a year, when time and tide align, manta rays from throughout the Maldives converge here to feed in a spectacular coral-reef ballet.

但是，当时间与潮流相吻合时，这里每年都会上演好几次蝠鲼争食的壮观芭蕾舞剧。

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Doctors use several tools to screen for colon cancer and precancerous lesions, including blood tests and imaging technologies such as X-rays and CT scans (also known as "virtual" colonoscopies).

医生运用几种措施筛查结肠癌以及癌前期病变，包括血液检测以及如x 线和CT筛查（也称虚拟结肠镜）的影像学手段。

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Nova held the Tampa Bay Rays scoreless over four innings Tuesday, working out of several jams with a resolve that impressed his manager.

WSJ: Yankees: How Mariano Rivera Set Ivan Nova Straight

That realization has prompted several teams, most notably the Tampa Bay Rays, to offer low-cost, long-term deals to players in the nascent stages of their careers.

WSJ: Mets: The Thinking Behind Jon Niese's Deal

Unencrypted Blu-Rays will work in the native player (with the right decoder) and several improvements have been made to video playback and the bundled codec library.

ENGADGET: MediaPortal 1.3 exits beta with official Windows 8 support, revamped skins