He waved desperately to his companion, who had been water skiing for the last fifteen minutes.
这句话的water ski是动词?为什么会有这种动词,这不符合语法啊,无论它是双谓语还是名词+动词。
water ski:滑水。为合成动词,不及物。也可拼写为 waterski.
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【个人观点】合成动词可以由名词加动词得来, 比如日光浴sun bathe,找房子house hunt。
It is surprising that Tom should have been sun bathing all day long.