When the dog is moved at a slow trot towards an observer, its straight front legs track comparatively close together at the ground.
当狗以慢速小跑，面对裁判走来时，可以观察到前肢很直，足爪在地面的落点非常靠近。
When the dog is moved at a slow trot toward an observer its straight front legs track comparatively close together at the ground.
当狗以慢速小跑，面对裁判走来时，可以观察到前肢很直，足爪在地面的落点非常靠近。
None can be an impartial or wise observer of human life but from the vantage ground of what we should call voluntary poverty.
唯有站在我们所谓的甘贫乐苦这有利地位上，才能成为大公无私的聪明的观察者。
The ground reflection and attenuation must be properly accounted for in order to use the source spectrum measured at the site of the observer to predict the actual source spectrum in the free field.
为利用观察点处实测声频谱来预估实际声源自由场频谱特性，必须适当地计及地面反射和衰减效应的影响。
But if the observer shifts position and look "down" the wall, then these lines cease to appear parallel and level with the ground and instead appear to come together as they recede.
但是如果观察者移动一下位置，面对着墙(这时墙就是“俯视”自己)，那么这些线条就不再是和地面平行了，相反，它们好像自己后退了一样合到了一起。
Exceptions occur when the observer is high above the ground, for example in an aeroplane (see above), on top of a mountain, or above a waterfall.
例外情况发生时，观测高空，例如在飞机(见上文)，在一个山头，或以上的瀑布。
Exceptions occur when the observer is high above the ground, for example in an aeroplane (see above), on top of a mountain, or above a waterfall.
例外情况发生时，观测高空，例如在飞机(见上文)，在一个山头，或以上的瀑布。
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