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关注：1
2013-05-23 12:21
求翻译：the brightness ratio of target and background is an essential factor to ensure the security of transportation, so in the experiment, kinds of visual targets were used to analyze the influence of contrast to observer’s reaction time.是什么意思？ 待解决
 悬赏分：1
- 离问题结束还有
the brightness ratio of target and background is an essential factor to ensure the security of transportation, so in the experiment, kinds of visual targets were used to analyze the influence of contrast to observer’s reaction time.
问题补充： |
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