transactional law指的是法律事务，泛指与法律有关的事物。

而commercial law指商业法，专指在商业方面的法律。例句：transactional law1、Any transactional law rules in real estate law come from the ancient English commonlaw. 美国房地产交易的诸多规则皆源自古老的英国普通法。

2、The clients' identity materials and transactional information as acquired by the judicial organ according to the present Law shall only be used in the criminallitigation on anti-money laundering. 司法机关依照本法获得的客户身份资料和交易信息，只能用于反洗钱刑事诉讼。commercial law1、Modern market economy, the urgent need of independent commercial law.现代市场经济的发展，迫切需要商法的独立。

2、We are experienced american attorneys with expertise in various aspects of business and commercial law and litigation. 我们是一批富有经验的美国律师，精通商业，商法和诉讼的各个方面。

3、Based on this, it analyses the boundary of civil law and commercial law, and investigates the legislation mode of civil law and commercial law. 并以民法商法化为切入口，分析了民法与商法的界限，对民法和商法的立法模式作了简要的探讨。

4、It should be achieved primarily by the commercial law to regulate the market economy. 对市场经济的法律调整主要应当是由商事法律规范来实现。