Example
fǒu zé否则，yòng用zuǒ左shǒu手chuán dì传递shí wù食物huì会bèi被rèn wéi认为shì是bù不lǐ mào礼貌de的，yīn wèi因为zuǒ左shǒu手shì是yòng lái用来xǐ zǎo洗澡de的。
否则，用左手传递食物会被认为是不礼貌的，因为左手是用来洗澡的。
Otherwise, it is considered impolite to pass food with the left hand, because the left hand is used for bathing.