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There are seven ups and eight downs in mathematics
Fifteen buckets drew water seven times and eight times, and scored a number (fourth grade math problem)-answer: 7/8 (7/8).

be in a bad mood

Mr. w incarnation

Explain the metaphor and feel uneasy.

The origin of Shi Ming Naian's "The Water Margin" is the 26th time: "Then Hu Zhengqing drew fifteen buckets of water in his heart and thought to himself,' Since he kindly invited us to drink, how can he treat us like this and forbid people to leave?' "

Idioms with complicated structures

Used as object and attribute; Used in spoken English

Synonym fifteen buckets of water, seven ups and downs.

For example, the 40th time in the Biography of Heroes of Children in Qing Dynasty: "How can she answer this sentence? So she only worries that she is like fifteen buckets to draw water, up and down. "

Bucket chain in the well