The trigger zone is hard to customize with simple lenses.

使用简单的镜片，很难定制出触发器区域。

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Cities as different ethnic cultures of the main meeting point, the issue of ethnic relations is the main trigger zone.

城市作为不同民族各种文化的主要交汇点，已经是民族关系题目的主要引发区。

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The major failure causes included technical difficulties, vasovagal reactions, the absence of a distinct trigger zone, and no analgesia induced by procaine test.

失败的主要原因包括：卵圆孔穿刺技术，迷走神经反应，无扳机点，普鲁卡因测试不能达到完全不痛。

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On the other side are those who argue that the American deficit and debt are already in the red zone, and a further delay in cutting them could trigger a European-style debt crisis we cannot afford.

FORBES: The Fiscal Cliff: Three Lessons From Europe