non sequitur
n
(Latin 拉) statement that does not follow logically from the previous statement(s) or argument(s) 不根据前提的推理
This non sequitur invalidates his argument. 他不根据前提推理因而论证无效.
In towns that are near the sea, the tiny lanterns which had been hung in the streets the night before, are placed into the water when the festival is over.