从国际社会的实践来看，国际惯例主要是通过当事人选择而得到适用，也有少数国家法律规定可以强制适用。
In practice, the international commercial usage is mainly applied with the choice of the parties involved and in a few countries it is applicable by the statutes.
当事人选择适用外国法律的，应当提供该国法律。
If any party chooses the applicable foreign laws, he shall provide the laws of this country.
由于明示选择透明度强，对当事人选择法律的意思表示容易确定，大多数国家的立法都采用明示选择法律的方式。
The legislation organ of most countries adopts the way of express in choosing the law based on its greater transparency and the meaning of the choice of governing law may be easily ascertained.
第三条当事人选择或者变更选择合同争议应适用的法律，应当以明示的方式进行。
Article 3: If the concerned parties select or change their selection of the law applicable in a contract dispute, they shall do so expressly.
第三条当事人选择或者变更选择合同争议应适用的法律，应当以明示的方式进行。
Article 3 The parties shall choose a law or modify a choice of law governing a contractual dispute in an explicit manner.
第三条当事人选择或者变更选择合同争议应适用的法律，应当以明示的方式进行。
Article 3 The parties shall choose a law or modify a choice of law governing a contractual dispute in an explicit manner.
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