Plaque is the main enemy of healthy teeth.

牙菌斑是牙齿健康的首要敌人。

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We left John Carter at the beginning of a fierce battle between the green warriors and their main enemy.

绿色的战士和他们的主要敌人之间，我们在一场激烈的战斗开始时离开约翰·卡特。

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Its main enemy today is forest fires. This slow-moving mammal cannot move quickly enough to escape the deadly fires which perennially ravage the land.

如今它的主要敌人是森林火灾，这种行动迟缓的哺乳动物跑得不够快，无法逃过那些不断破坏土地的致命火灾。

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He says that Russian people once again see the United States as the country's main enemy.

NPR: Rice, Gates Appeal to Moscow for Missile Defense

America promoted a strong dollar throughout the 1990s, when inflation was still thought to be the main enemy.

ECONOMIST: Currencies

Clearly my main enemy (and at times best friend) is email!

FORBES: Here are my top picks this month!