所有国家都允许外国人入境吗？

　　Whether foreigners are allowed entry is decided by the individual country.

　　是否允许外国人入境是由国家决定的。

　　It is absolutely the scope of the sovereignty within a country whether foreigners are allowed entry.

　　一国是否准许外国人入境，完全是国家主权范围内的事项。

　　What certificates and procedures does a foreigner need to enter a country?

　　外国人入境需要哪些证件及程序？

　　Generally speaking, passports and visas are needed while entering a foreign country.

　　通常来讲，入境必备的两件就是护照与签证。

　　On some occasion, on the basis of reciprocity, some countries allow entry of foreigners without visas through agreements.

　　也有些国家，在互惠的基础上，通过协议，互免签证。

　　In order to protect legitimate interests, a country has its right to refuse entry of some kind of people.

　　为了维护本国的合法利益，国家有权限制某些外国人入境。

　　What regulations do we have in terms of refusing entry into another country?

　　对拒绝入境都有什么规定？

　　Generally speaking, such kind of people is not allowed entry into another country as psychopaths, infectious people, criminals and people who are in illegitimate occupation.

　　各国一般不允许以下人员入境：精神病患者、传染病患者、刑事罪犯、从事不正当职业者。

　　The restrictions on entering a foreign country should not act against the fundamental principles of International Law.

　　对于入境的种种限制不得违反国际法的基本原则。

　　Different countries have their unique regulations on entry into their countries.

　　不同国家对于入境也有自己的规定。

　　Are there any regulations about residency of foreigners after their entry?

　　对于外国公民入境后的居留权有哪些规定？

　　In accordance with the laws in the host country and relational international treaties or agreements, foreigners can obtain long-term, short term or permanent residency.

　　根据所在国的法律和有关的国际条例或协定，可以在该国短期、长期或永久居留。

　　Foreigners who can not obtain long term residency before he or she asks for and gets permission.

　　外国人未经请求并获得许可不能在一国领土内长期居留。