1.variation

n.

[definition]:變異；變體；變奏；變種--seasonal variation,genetic variation,temporal variation,slight variation,wide variation.

[synonyms]:difference,disparity,dissimilarity,distinction,discrepancy

[antonyms]:similarity

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2.reference

n.

[definition]:參考；編號；提到；查詢--get reference,make reference,contain reference,provide reference,give reference,positive reference,direct reference,oblique reference,important reference,reference brief

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3.inhabit

v.

[definition]:居住(在)；棲息(在)；占據(jù)；充斥--growing to two or three inches long, krill provides the major food for the great blue whale, the largest animal to ever inhabit the Earth越來越兩三英寸長，主要漁獲為糧食大藍鯨，最大的動物都生活在地球上.

[synonyms]:live,dwell,occupy,reside,populate

4.deteriorate

v.

[definition]:退化；變質(zhì)；敗壞(風俗)；降低(品質(zhì)等)

[synonyms]:decline,depreciate,fade,fail,get worse

[antonyms]:improve

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5.echolocation

n.

[definition]:（尤指海豚、蝙蝠等動物的）回聲定位

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回顧：1.variation 2.reference 3.inhabit 4.deteriorate 5.echolocation