工人全然不知出售公司的计划。
Workers were kept in the dark about the plans to sell the company.
我们全然不知，因为大脑把它认为属于图像的东西填进去了，所以图像对我们来说总是表现出完整的。
We aren't aware of it, because the brain fills in what it thinks belongs in the image, so the picture always appears complete to us.
有时人们心脏病发作却对此全然不知。
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