In January 1994 an oil barge ran aground off the coast of San Juan, Puerto Rico, and [its] cargo of 750000 gallons leaked into the ocean, polluting ther city\s beaches.
我想问下,在it前面有两个单数名词,an oil barge 以及the coast of San Juan, Puerto Rico, 这样不会造成指代不明么?还是说,根据后面的意思,只能是an oil barge,所以不会造成混淆?谢谢!