简述我国涉外合同的法律适用原则。

Proper law of Contract

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请将以下国际法专业文献中的术语与段落翻译为中文。 As a general rule．Swiss law applies the so一called lex situs principle in determining choice一of—law in cases where the ownership of tangible．movable propertys disputed．Under the lex situs rule，a forum court must apply the substantive law of the place where the tangible，movable property was physically located at the time of its sale．

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请将以下国际法专业文献中的段落翻译为中文。 Characterization is a two—step process in property cases．First the court must decide whetheror not the case presents a property problem．Then it must determine whether interest involred is a“movable”or an“immovable”．The basic test for distinguishing“movable”and“immovable”iswho closely the particular interest is concerned with land．

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个甲国商人指示他在乙国的代理商采办某种货物，该代理商便按照甲国商人的指示买到货物，并把货物提交给那个甲国商人租的船舶。在该船舶离开乙国港口之前，甲国商人破产。于是，乙国代理商扣留了货物。按照甲国法，货物的所有权已转移给甲国商人，该代理商无权扣留货物；但按照乙国法，该代理商仍是货物的所有者，有权扣留货物。 请问：本案应适用何国法律?为什么?

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