习焉不察

dà jiā duì yú cháng jiàn de shì wù wǎng wǎng xí yān bù chá

大家对于常见的事物往往习焉不察。

People usually do not question what they are accustomed to.

wǒ men tiān tiān yòng hàn yǔ duì hàn yǔ de yǔ fǎ què xí yān bù chá

我们天天用汉语，对汉语的语法却习焉不察。

Though we use the Chinese language every day, we have no awareness of its grammar.