The invitation letter is returned to the leaflet of the international health code visa. Is it true to work abroad?

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According to Sohu. Com, you need an invitation letter, passport, health certificate and photos to apply for a visa, and you can go abroad to work after you get a visa.

Visa is a measure taken by sovereign countries to safeguard their sovereignty, dignity, security and interests, and it is also an important means for sovereign countries to implement exit and entry management.