But crediting the aperture effect's ability to discombobulate biting flies appears to be flawed-because the researchers found that checked surfaces were just as effective at repelling flies as were stripes.

但是，认为孔径效应能够让叮咬的苍蝇感到困惑似乎是有缺陷的——因为研究人员发现，格子状的表面和条纹状的表面在驱赶苍蝇方面同样有效。

That means no drones or observations from a distance - a human person has to check every surface of the steel from, at minimum, an arm's length away.

这意味着无法使用无人机或进行远距离观察——人类必须至少在一臂距离之外检查钢材的每个表面。