讨论 1 有文献报道[3]当某些金属、合金材料,尤其磁性物质进入mri磁场中,会在一定范围产生" 黑区 "( black area ),使相应区域的影像消失、模糊,组织和结构变形等,这种在mri磁场中所造成的现象统称为伪影(artifact).
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传真机先扫瞄印刷文字和图像数据,然后把这些影像转为数字码:1代表黑区,0代表白区。
Fax machines scan printed text and graphics and convert the image into a digital code: 1 for dark areas, 0 for white areas.
女儿是一位摄影师,住在巴黎的玛黑区--哦,真是个好地方,母亲说道,粗糙的脸上有了生气。
Their daughter, a photographer, lived in the Marais ?oh, a charming place, the mother said, her coarse features animated.
这头可爱的雌性小犀牛是该保护区今年出生的第二只黑犀牛,但要判断这些幼崽是否会成为返回野生保护区的好的候选者还为时过早。
The adorable female calf is the second black rhino born this year at the reserve, but it is too early to tell if the calves will make good candidates to be returned to protected areas of the wild.
It's not too far from downtown. Haight-Ashbury's right here.
离市区不远。海特-黑什伯里区就在那里。
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