This is the 8468th most frequent Chinese word.
re
The Chinese word "热" (rè) means "hot" or "heat" in English.
In this sentence, '热' means 'hot'. It describes the high temperature of the water.
这个水很热，我们需要等一会儿冷却。
This water is very hot, we need to wait for it to cool down.
Here, '热' is used to describe the hot temperature of the sunlight during summer.
夏天的太阳真热，记得涂防晒霜。
The summer sun is really hot; remember to apply sunscreen.
In this instance, '热' extends to mean 'passion' or 'enthusiasm', indicating one's strong interest in a subject or activity.