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Exercise:When generating elements with v-for, which specific attribute is always recommended to use?
<fish-type
v-for="x in fish"
:@(3)="x.id"
:fish-name="x.name"
:img-url="x.url"
/>
<fish-type
v-for="x in fish"
:key="x.id"
:fish-name="x.name"
:img-url="x.url"
/>
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