名詞解釋：小龍蝦(學(xué)名：Procambarus clarkii)：也稱克氏原螯蝦、紅螯蝦和淡水小龍蝦。形似蝦而甲殼堅(jiān)硬。成體長(zhǎng)約5.6~11.9厘米，暗紅色，甲殼部分近黑色，腹部背面有一楔形條紋。幼蝦體為均勻的灰色，有時(shí)具黑色波紋。螯狹長(zhǎng)。甲殼中部不被網(wǎng)眼狀空隙分隔，甲殼上明顯具顆粒。額劍具側(cè)棘或額劍端部具刻痕。你知道用英語(yǔ)怎么表達(dá)嗎?

　　The North American signal crayfish, which had been introduced to English waters decades ago and spread steadily north, were taking over.

　　Some of these things were about 10 to 12 inches long. At that size, they don't even look like crayfish; they look like lobsters.

　　The problem isn't just the size or quantity of the intruders; it's that the crayfish eat the same insects and larvae as the prize-winning trout that are native to these streams.

　　Many local residents are worried that the crayfish may be destroying Scottish ecology.

　　北美標(biāo)志性的小龍蝦是在數(shù)十年前被引入英國(guó)境內(nèi)，并且向北蔓延，最后占據(jù)了水域。

　　有一些小龍蝦都能長(zhǎng)到10到12英寸。有著這樣的尺寸，它們甚至看起來(lái)都不像小龍蝦，而更像大龍蝦。

　　問題不是只在于這些入侵者的尺寸或者數(shù)量，而是這些小龍蝦會(huì)吃掉同樣生活在這片水域的鱒魚賴以為生的昆蟲和幼蟲。

　　許多當(dāng)?shù)氐木用穸紦?dān)心這些小龍蝦可能會(huì)毀掉蘇格蘭的生態(tài)。

　　【講解】

　　文中的crayfish就是“小龍蝦”的意思，也稱紅螯蝦和淡水小龍蝦，因肉味鮮美廣受人們歡迎，尤其是麻辣小龍蝦(hot and spicy crayfish)，而龍蝦(lobster)主要分布于熱帶海域(tropical seas)，是名貴的海產(chǎn)品(marine product)。

　　第三段中的trout解釋為“鱒魚”，是一類很有價(jià)值的垂釣魚和食用魚，類似的垂釣魚還有：grouper(石斑魚)、tuna(金槍魚)、cod(鱈魚)等。