本期内容：

Fish are often said to have a three-second memory, but the brain power of fish has been considerably underestimated, according to scientists who found some fish can recognise themselves in the mirror. Their findings suggest that a small, otherwise unremarkable species called the cleaner wrasse has joined an elite handful of others to have passed the so-called mirror test, which has been used for decades as a gold standard measure of animal intelligence. Passing the test is widely viewed as an indication of self-awareness and until now the only animals to have crossed this threshold are great apes, bottlenose dolphins, killer whales, Eurasian magpies and a single Asian elephant.

considerably: adv. 相当地；非常地
considerable: adj. 可观的；重要的；值得考虑的
awful: adj. 糟糕的；可怕的
awfully: adv. 相当地；非常地
underestimate: vt. 过低的估计
overestimate: vt. 过高的估计
otherwise: adv. 否则；本来
species: n. 物种
gold standard: 金标准；黄金准则
threshold: n. 门槛
magpie: n. 喜鹊

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