Watch video of sewer divers in Mexico City.

墨西哥下水道潜水员。

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Most manufacturers recommend divers to have their diving watch pressure tested by an authorized service and repair facility annually or every two to three years and have the seals replaced.

大局部的制造商建议潜水员到授权机构停止潜水表压力测试并且每年或两到三年修缮一次潜水表的零件，以及改换密封件。

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After breakfast, proceed to Sea World. See spectacular shows by the dolphins and the sea lions. Watch the fantastic display by divers in the shark feeding sessions.

早餐后，前往游览澳洲最大的海洋世界，海豚，海狮，海狗，鲸鱼和惊险的海底喂养鲨鱼和精彩有趣的花式滑冰表演等。

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Eager divers watch in wonder as these five to six metre creatures swim stealthily around the shoal in search of breakfast, their distinctive tails cutting silently through the water.

BBC: Swimming with sharks in the Philippines