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chemical recycling
Chemical recycling is making a significant contribution to environmental protection.
big, large, great
He owns a big house.
contribution
His research made a significant contribution to the scientific community.
contribute; make a contribution
I am doing volunteer work to contribute to the community.
recycling
We are actively promoting recycling.
recycle
We recycle paper and plastic every Friday.
environment, surroundings / the natural environment
We must strive to protect the environment of the Earth.
protection; safeguard
This zoo is putting a lot of effort into the protection of endangered species.
to shield (to protect, to defend)
He did his best to protect me from danger.
(slang) Alternative form of 大きいお友達
He treats us as a big friend.
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