It's necessary __(keep)the balance of yin and yang.

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It's necessary __(keep)the balance of yin and yang.
It's necessary __(keep)the balance of yin and yang.

It's necessary __(keep)the balance of yin and yang.
to keep

to keep

to keep

it is necessary to do做某事有必要
所以是to keep

to keep

保持阴阳平衡是有必要的。