a line on a rock surface or the ground that traces a geological fault
(岩石表面或地面的)断层线。
a divisive issue or difference of opinion that is likely to have serious consequences
(可能引发严重后果的)分歧;裂痕
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religion is now the great fault line of American politics. 宗教现已成为美国政治中可能引发重大分裂的问题。