n.加法器，（欧洲产）蝰蛇（小毒蛇），（北美产无毒的）猪鼻蛇
He is as deaf as a post [ stone , door - post , door - nail , an adder ].
他完全聋 了.
The adder is Britain's only venomous snake.
蝰蛇是英国唯一的一种毒蛇。
By far the most common snake in Britain is the adder.
在英国最常见的蛇是蝰蛇.
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