Working on a comparable timescale, SIM should provide positional information for a subsample of faint stars, thereby probing the most tenuous star streams.
在

,SIM应能提供黯淡恒星次级
本的位置资讯,从而侦测

的恒星流。
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画科普 Often, the evolution of this kind of camouflage is detectable on a shorter timescale too - the populations of dark-coloured peppered moths grew in England, for example, as sooty pollution increased in the 19th century during the Industrial Revolution.
通常来说,在较短一段时间内也能观察到伪装的进化发展——例如,19世纪工业革命期间,烟尘污染增加时,英国深色胡椒蛾的数量有所增加。
The timescale problem is that cause and effect may be separated by milliseconds (switching on a light bulb and experiencing illumination), minutes (having a drink and feeling tipsy) or even hours (eating something bad and getting food poisoning).
时间方面的问题在于,因果可能以毫秒(打开灯泡并感受到照明)、分钟(喝饮料并感到醉意)甚至小时(吃坏肚子并食物中毒)为单位出现。