There are two kinds of jury challenges. A prospective juror can be challenged "for cause" if he has some kind of a conflict or legal barrier - for example, if he is a friend of the defendant.

请求陪审员回避有两种情况，陪审员有某种冲突或法律方面的障碍可以提出回避，比方说这名陪审员是被告的朋友。

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A formal objection to the inclusion of a prospective juror in a jury.

正式对某位预期的陪审员列入陪审团表示异议。

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One prospective juror said she couldn't believe the young man with the buzz cut and blue oxford shirt could be a terrorist bomber.

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If a prospective juror did not find this process painful enough, there was always the chance that he or she might actually get a jury.

FORBES: This is Why People Hate Jury Duty