飞猪、携程、去哪儿、同程，低价机票藏“小字加价”套路

Use 比…更… to compare two things, showing that the first item is more of some quality than the second.

Use 一旦…就… to describe that once the first action or situation happens, the second action will immediately follow.

Use 即使…也… to express that even if the first condition happens, the result in the second clause remains unchanged.

Use 如果…就… to talk about a conditional situation: if the condition happens, then the result follows.

Use 将…包装成… to describe turning or presenting something as something else, often to emphasize the manner or purpose.