It is often misjudged the flaw echo in ultrasonic examination that the echo signals produced by sound field property and geometrical shape of the component examined according to sound field theory.

超声探伤中，由于声场特性、件几何形状的影响，所产生的各种回波信号常常被误判为缺陷信号。

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Football may be a game with very little on-field action ( a 2010 examination by the Journal's David Biderman showed there's about 11 minutes of play during an NFL contest), but it brilliantly raised its interstices into an art form.

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And this field of research being a self-examination, there are also many controversies, not all driven by strictly scientific motives.

ECONOMIST: The proper study of mankind