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The begging persons use a broken bowl ask for money or something to eat.But the [bcwl] not the one for them.
The rim of bowl was cut by triangle,as a begging bowl,remind the user save and don't waste food.
Also it can put you spoons,chopsticks.
When someone hold a bowl with soup for you,would your mind the finger touch the soup?It's never happen,when the bowl is [bcwl].
Jiang Du;Wang Qiang