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It's our duty ( 或responsibility )to keep the ecosystem balanced.
cynthiahql
it's our duty to keep the environment balanced
qianting13
It is our duty to keep the ecological balance, English translation
漳南一邺
it's our duty to do the work well
全能小吃货
It is our duty to keep ecological balance.
密果儿小YO
It is our duty to the protection of the environment
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