Objective To obtain the expiratory resistance in pressure oxygen mask under no overpressure condition with numerical simulation method.

目的用数值模拟的方法获得加压供氧面罩无余压状态下呼气活门的呼气阻力。

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A novel algorithm of face detection based on mask transform and template match makes face detection more accurate and faster in different face sizes with complex condition.

使用一种新的假面变换和模板匹配的人脸检测算法，能够对复杂环境中大小不等的人脸进行快速、准确的检测。

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Behind each mask there is one or more myth or tale story, and in it contains mass cultural connotation. It reflects the living condition and cultural mentality of the people lived even earlier.

每一个面具背后都有至少一个神话和传说故事，而内容都蕴含了大量的文化内涵，它反映了更早期的原始先民的生存状态和文化心理。

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Professors Brian Wharton and Ian Booth, from the Institutes of Child Health in London and Birmingham, warned that in people with vitamin B12 deficiency, consumption of folic acid may mask a condition called megaloblastic anaemia - which if not picked up can lead to degeneration of the spinal cord.

BBC: Caution urged over folic acid

Though it is not, in itself, a life-threatening condition, trimethylaminuria leads many sufferers to heavy smoking (in an effort to mask their appalling odour) or, in at least one case, to suicide.

ECONOMIST: Hook, line and stinker