前面是an，例如：
1.The inside of the box will be like an oven.盒子的内部就像烤箱一样。
2.Jacqueline Hansson from Amy Cleaners shows us how to clean an oven so that it gleams with pride.艾美清洁中心的Jacqueline Hansson向我们展示怎样清洁烤箱，让它重新散发出光彩。
3.Open a window, it's like an oven in here!打开窗户。这儿热得像火炉！
