1、The toddler rested his head on the soft nucha of his mother's arm.
那个幼儿将头枕在他妈妈手臂柔软的颈后。
2、She placed a rolled-up towel under her nucha to support her neck while sleeping.
她在睡觉时在颈后放了一条卷起来的毛巾以支撑脖子。