"He": ① Conjunction, sometimes used with the word "He". For example, the ratio of medicine to water is ...; Team A and Team B finish together ...;

② The result of adding several addends: addend+addend = sum. For example, "The sum of the speeds of Party A and Party B is …" is the speed of Party A plus the speed of Party B..

The word "He" is not widely used in application problems, but generally appears in the "problem" of application problems, meaning "transformation" and "transformation into ……". How many square meters ... How many acres? The calculation result needs to be converted into the quantity in the management department.