The visual fields can be roughly estimated by confrontation.
测定视野可用对照法粗略估计.
辞典例句
The population of this city is roughly estimated at about one million.
这个城市的人口粗略计算大约是100万.
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There is a huge disparity between the numbers you two roughly estimated.
你俩粗估出来的数字怎么差距这么大.
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