It can bring the simplest beauty in the gift of a shell or the harshest danger from the pull of a rip tide.

大海能通过贝壳展现出最纯朴的美，也能够用惊涛骇浪带来最严酷的危害。

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The tide is affected by the magnetic pull of the moon.

潮汐会受到月球磁场拉力的影响。

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Although most Americans now think the war was a mistake, polls suggest that Mr McCain's determination to see it through may stand him in better stead with voters than Mr Obama's determination to pull out whatever the consequences, especially since the tide of war seems at last to have shifted firmly in America's favour.

ECONOMIST: The presidential election