When ducks walked on the small embankments between rice paddies or on a small bridge, they'd get into a long line, and you could count them by threes as they went by--one, two, three, four--and then multiply at the end for the total.
當鴨子走過田埂、小橋，排成長長隊伍時，就用竹竿點，三隻一組，一、二、三、四，一路數下去，末了乘乘，便可知總數。