他行踪不定，四海为家。
His whereabouts are uncertain - he could be living anywhere.
但是观察这一行踪不定的云层的机会正在增加。
But the chances of seeing these elusive clouds are increasing.
布鲁斯•科恩进一步指出，在太阳系，那些行踪不定的小行星的干扰是不会停止的。
Plus as Bruce Koehn points out, our solar system's dance of asteroids is hardly set in stone.
苏拉是一种只生活在越南和老挝山区的野生动物，由于它珍稀且行踪不定，人们称其为“亚洲麒麟”。
The animal is listed as critically endangered, with just a few hundred thought to exist in the wild.
而所谓的“摄像机陷阱”———只有动物触发传感器才会启动的摄像机——则能拍到雪豹等行踪不定的动物的近距离镜头。
Something called "camera traps"–cameras that switch on only when animals trigger their sensors–also helped get close-up shots of *elusive creatures such as snow leopards.
唐代船商以客贩为主要经营方式，他们贩运四方行踪不定，逐渐使他们淡化了“恋家”观念，导致了多数船商家庭的不稳定。
In Tang Dynasty, ship merchants mainly undertook traveling trade. Because they traveled frequently, they did not care much about home and their family relationship often became unstable.
为了寻找行踪不定的次原子微粒——中微子，费米实验室的研究人员去年进行了MiniBooNE研究，宣称他们发现了非常反常的现象。
Last year researchers involved in Fermilab's MiniBooNE study, which detects elusive subatomic particles called neutrinos, announced that they had found a surprising anomaly.
为了寻找行踪不定的次原子微粒——中微子，费米实验室的研究人员去年进行了MiniBooNE研究，宣称他们发现了非常反常的现象。
Last year researchers involved in Fermilab's MiniBooNE study, which detects elusive subatomic particles called neutrinos, announced that they had found a surprising anomaly.
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