求翻译：三是入境人员相对集中于日本、德国、韩国、美国等4个国家。四是马钢等大公司聘请的从事技术的部分外籍专家长期停留本市，连续进行签证延期。是什么意思？

Immigration officers are relatively concentrated in four countries, including Japan, Germany, South Korea, the United States. Maanshan Steel and other large companies employ some foreign experts engaged in technical long-term stay in the city, and continuous for a visa extension.

3 is a relatively concentrated immigration officers in Japan, Germany, South Korea, the United States, 4 countries. Ma steel is 4, and other large companies engaged in technology employed by some foreign experts, long-term stay in this city for a visa extension.

Three, enters a country the personnel to concentrate relatively in Japan, Germany, South Korea, US and so on 4 countries.Four is Ma Gang and so on the big company invites to be engaged in technical part foreign expert long-term pause this city, carries on the visa extension continuously.

Three is the relative concentration of travellers in Japan, and Germany, and Korea and the United States in 4 countries. Four are large companies such as steel technology employed by some foreign experts long residence in the city, visa extension in a row.

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