1.Under the ruling Thursday, states can pass laws requiring out-of-state sellers to collect the state's sales tax from customers and send it to the state.
2.Those retailers may face headaches complying with various state sales tax laws.
1.Under the ruling Thursday, states can pass laws requiring out-of-state sellers to collect the state's sales tax from customers and send it to the state. 黑体部分为现在分词短语作定语修饰laws. 可以改为定语从句:that require...
2.Those retailers may face headaches complying with various state sales tax laws. 黑体部分为现在分词短语作时间状语,可以改为时间状语从句:when they comply with...