雾里看花(wùlǐkàn huā)

Unable to see things clearly; to see things blearily

例：对于房价到底有多大水分，消费者只能是雾里看花。只有房地产开发商心知肚明。

(duìyúfáng jiàdào dǐyǒu duōdàshuǐfèn, xiāo fèi zhězhǐnéng shìwùlǐkàn huā, zhǐyǒu fáng dìchǎn kāi fāshāng xīn zhīdùmíng)

Consumers can hardly see the real cost because of the extras added to the housing prices. Only the real estate developers know.