hibernation

刺猬在冬天会进入冬眠状态以节省能量。

Hedgehogs enter ___hibernation in winter to conserve energy.

为了节省能源，电脑在不使用时会自动进入休眠模式。

To save power, the computer automatically goes into ___hibernation mode when not in use.

考试季结束后，他进入了短暂的社交休眠期，几乎不参加任何聚会。

After finals week, he went into social ___hibernation and barely attended any gatherings.