现在,海星数量很少,对珊瑚礁的影响也不大。
Now, in small numbers, the starfish don't affect coral reefs dramatically.
令人惊讶的是,在潮汐流很弱的地方,幼年马蹄蟹的藤壶数量并不多,尽管它们很少在洞里活动。
Surprisingly, in areas where tidal currents are very weak, juvenile horseshoe crabs are found not to have significant barnacle populations, even though they seldom burrow.
由于大部分有关其生活范围的研究还很少,所以很难统计出全球北极能的数量。
It is difficult to figure out a global population of polar bears as much of the range has been poorly studied.
During the sixteenth century, the peacetime armies of the Continental Powers were about 10,000 to 20,000 soldiers--very, very little.
6世纪时,欧洲大陆上的强国,和平时期的军队数量很少,大约一万到两万人
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