他总是丢三落四,出门前都要检查好几遍。Tā zǒngshì diūsān làsì, chūmén qián dōu yào jiǎnchá hǎo jǐ biàn.He is always forgetful, so he has to check several times before leaving the house.
奶奶年纪大了,做事常常丢三落四。Nǎinai niánjì dà le, zuòshì chángcháng diūsān làsì.Grandma is getting old and often forgets things.
你这样丢三落四的,怎么能当好班长呢?Nǐ zhèyàng diūsān làsì de, zěnme néng dāng hǎo bānzhǎng ne?Being this scatterbrained, how can you be a good class monitor?