“一大片”的拼音为：yī dà piàn...

你应该用绳子围起一大片地方来卖票。You should rope off a big field and sell tickets.布加勒斯特的所在地过去曾是一大片茂密的森林。Where Bucharest now stands, there once was a large, dense forest.它们飞到海滩上空，抛下一大片黑影。They flew in over the beach, casting a huge shadow...

“一大片”的英语可以翻译为：a sheet ...