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原则上来说,生物系统的衰老和死亡都不是必然的。
It is not, in principle, necessary for a biological system to age and die.
youdao
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生物课上,学了生物系统的物质循环。
In the biological class, has studied the living system material circulation.
youdao
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生物课上,学了生物系统的物质循环。
In the biological class, has studied the living system material circulation.
youdao