High score to answer questions about multiple languages on the website

High score: multi-language website problems. if the website requires multiple languages, what kind of links are easily accepted by search engines? The website has multiple languages, which are just language translation. The structure between different languages has the same page layout. There are two solutions. let's take a look at which one is better and give the specific reason. Where is the problem? A scheme uses URL parameters. For example, http: // ww.
If a website needs multiple languages, what kind of links are easily accepted by search engines?

The website has multiple languages, which are just language translation. The structure between different languages has the same page layout.

There are two solutions. let's take a look at which one is better and give the specific reason. Where is the problem?
A scheme uses URL parameters. For example
Http://www.enfsolar.com/directory/application? Lang = kr
Http://www.enfsolar.com/directory/application? Lang = de
Http://www.enfsolar.com/directory/application? Lang = it

The second solution is second-level domain name. For example
Http://kr.enfsolar.com/directory/application
Http://de.enfsolar.com/directory/application
Http://it.enfsolar.com/directory/application

Please give me some suggestions. if the error area is displayed, please move the moderator. thank you for sharing it:
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Must be the second type.
Static
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Acceptable for both search engines
However, the search engine regards the former type as one site, and the latter type may be indexed as multiple sites.