The so-called "hot weather in summer" means _ _ _ _ _; "Doing work can produce heat, and consuming heat can also do work" means _ _ _

The first air: the degree of heat and cold of an object is called temperature. It is hot in summer because the temperature is high in summer, so the heat here means high temperature.

The second space: Doing work can generate heat, and consuming heat can also do work, which is a way to change the internal energy of an object. Consuming heat can also do work, which means that the temperature of external work is reduced and the internal energy is reduced.

The third space: when the temperature of boiling water decreases, it releases heat to the outside, and the internal energy decreases. Reduced energy is transferred to other objects, and the transferred energy is called heat.

So the answer is: high temperature, internal energy, heat.