休眠

许多温带落叶树种在严酷的寒冬时节会自动脱落树叶，进入生理休眠状态。

xǔ duō wēn dài luò yè shù zhǒng zài yán kù de hán dōng shí jié huì zì dòng tuō luò shù yè, jìn rù shēng lǐ xiū mián zhuàng tài.

Many temperate deciduous tree species will automatically shed their leaves during the harsh winter and enter a state of physiological dormancy.