Tā bù yuànyì hé biérén fēnxiǎng, zǒng xiǎng dúzhàn suǒyǒu de wánjù.
She doesn't want to share with others and always wants to keep all the toys to herself.
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usage
The idiom 独占鳌头 (dúzhàn áotóu, 'to stand alone on the turtle's head') means to come first, to be the champion — from the imperial exam tradition where the top scholar stood on a carved turtle head.