中国被国际SOS列为医疗高风险国家，下面摘录一些SOS的条款，看看老外对我们国家的民俗认识有多深刻。

Water and Beverages

When purchasing bottled water, ensure that the lid is securely fastened.

Avoid ice, as it may have been made from unsafe water.

Food Risk

Fruit that you wash and peel yourself should be safe; avoid pre-peeled fruit.

Avoid street vendors.

Milk and other dairy products should be pasteurised.

General Cultural Tips

Food is often eaten with the hands and rice bowls lifted to the mouth.

Spitting phlegm during meals is common.

Superstition is taken seriously. Four is an unlucky number associated with death. People often decline a gift several times before accepting it.Be persistent until they accept.

Banquets are often extremely lavish, involving many courses and considerable alcohol.

If a foreigner becomes angry, their Chinese counterpart may react by laughing.

It is one way of maintaining self respect (‘face'). Loss of face can be humiliating.