hygiene

Poor sanitation and hygiene caused many of the soldiers to get sick.脏乱的卫生环境使得很多士兵患病。

He has very poor personal hygiene.他很不讲个人卫生。

Brushing your teeth regularly is an important part of good dental/oral hygiene.按时刷牙是保持牙齿/口腔卫生的重要组成部分。