向大海里倾倒污水既不卫生也不安全。
Discharge of raw sewage into the sea is unsanitary and unsafe.
这种行为既不卫生，也不健康，尤其是近距离向其他人喷口水的时候。
It's unhygienic and unhealthy, particularly if you spit close to other people.
吃饭时要精神集中，有些小同学在吃饭时看电视或看书报，这是不良的习惯，既不卫生，又影响食物的消化吸收，还会损伤视力。
Meals to concentrate, some students in a small meal to watch television or read newspaper, this is the bad habits, not health, affects digestion and absorption of food, but also damage eyesight.
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