They used carefully preserved dry branches and grass to make a fire in the cave to keep warm.
This was the idea of Queen Lin. Based on the nature of tropical jungles where it rains at any time, she suggested that some easily flammable dry grass and branches be stored along the way. If a rainstorm really happened, they could be used to make fire, thus saving time in searching for dry combustible materials.
What's more, in such a heavy rain, it is still a question whether there is time to find dry ignition, or whether dry ignition can be found.
Unexpectedly, not long after, these preserved dry grass and branches were put to important use.
The author has something to say: If you are interested in the method of making fire by drilling wood, you can check it out~ It's quite interesting~
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