詞匯解析：
一、adder
n.蝰蛇，寬蛇(英國僅有的一種毒蛇，背部有菱形斑)
The adder is Britain's only venomous snake.
蝰蛇是英國唯一的'一種毒蛇。
二、albatross
n.信天翁(白色長翼大海鳥，生活于太平洋和南半球海洋)；惹麻煩的事；苦惱；障礙
Sometimes he took eggs from albatross nests.
有時(shí)他還會(huì)從信天翁的巢里掏鳥蛋。
三、alligator
n.短吻鱷
He was grappling with an alligator in a lagoon
他正在環(huán)礁湖里與一只短吻鱷搏斗。
四、alpaca
n.羊駝(南美長毛動(dòng)物)；羊駝毛
Its fur is almost waterproof and softer than alpaca.
它們的毛幾乎不透水而且比羊駝毛更柔軟。