The surveyor could not see what was in front as his whole field of vision on that side was covered by the broad clumsy back of the driver.
土地测量员没法看清前面是什么，因为他的整片视野被车夫宽大而笨拙的背挡住了。
Utilizing computer to draw a caricaturing portrait is a front field of machine vision.
通过计算机进行人脸的肖像漫画绘制是机器视觉研究的前沿之一。
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