优胜劣汰
yōu shèng liè tài
survival of the fittest (idiom)
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她在唱歌比赛中获胜了。
tā zài chàng gē bǐ sài zhòng huò shèng le。
She won the singing competition.
她的舞蹈动作非常优美。
tā de wǔ dǎo dòng zuò fēi cháng yōu měi。
Her dance moves are very graceful.
顾客喜欢买优惠的商品。
gù kè xǐ huan mǎi yōu huì de shāng pǐn。
Customers like to buy discounted products.
他学习努力，并且成绩优秀。
tā xué xí nǔ lì， bìng qiě chéng jì yōu xiù。
He studies hard and gets excellent grades.