Apply suggestions from code review

Co-authored-by: Ayaka <[email protected]>

src/guide/components/slots.md

@@ -294,14 +294,14 @@ function BaseLayout(slots) {
 }
 ```
 
-## Conditional Slots {#conditional-slots}
+## 条件插槽 {#conditional-slots}
 
-<!-- TODO: translation -->Sometimes you want to render something based on whether or not a slot is present. 
+有时你需要根据插槽是否存在来渲染某些内容。 
 
-You can use the [$slots](/api/component-instance.html#slots) property in combination with a [v-if](/guide/essentials/conditional.html#v-if) to achieve this.
+你可以结合使用 [$slots](/api/component-instance.html#slots) 属性与 [v-if](/guide/essentials/conditional.html#v-if) 来实现。
 
-In the example below we define a Card component with two conditional slots: `header` and `footer`.
-When the header / footer is present we want wrap them to provide additional styling:
+在下面的示例中，我们定义了一个卡片组件，它拥有两个条件插槽：`header` 和 `footer`。
+当 header 或 footer 存在时，我们希望包装它们以提供额外的样式：
 
 ```vue-html
 <template>
@@ -321,7 +321,7 @@ When the header / footer is present we want wrap them to provide additional styl
 </template>
 ```
 
-[Try it in the Playground](https://play.vuejs.org/#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)
+[在演练场中尝试一下](https://play.vuejs.org/#eNpNkMFqwzAQRH9lMYU4pNg9Bye09NxbjzrEVda2iLwS0spQjP69a+yYHnRYad7MaOfiw/tqSliciybqYDxDRE7+qsiM3gWGGQJ2r+DoyyVivEOGLrgRDkIdFCmqa1G0ms2EELllVKQdRQa9AHBZ+PLtuEm7RCKVd+ChZRjTQqwctHQHDqbvMUDyd7mKip4AGNIBRyQujzArgtW/mlqb8HRSlLcEazrUv9oiDM49xGGvXgp5uT5his5iZV1f3r4HFHvDprVbaxPhZf4XkKub/CDLaep1T7IhGRhHb6WoTADNT2KWpu/aGv24qGKvrIrr5+Z7hnneQnJu6hURvKl3ryL/ARrVkuI=)](https://play.vuejs.org/#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)
 
 ## 动态插槽名 {#dynamic-slot-names}