If you add the menu as a child of the label itself, then the menu might not show up at all because the label will measure the text that it holds and create a dimension that fits the text only.
如果您将菜单添加为标签的子元素，那么菜单根本就不会显示，因为标签将仅度量它所包含的文本，然后创建一个符合文本的大小。
If the message part that is transferred in the header does not show up anywhere in the element, you have an implicit header. Listing 4 shows what this might look like.
如果在消息头中传送的消息部分没有在元素中显示，那么它就是一个隐式消息头。
The justice of the peace may not show up, the caterer's oven could break down or the reception hall might reserve the wrong date.
太平绅士（注2）可能缺席，厨房的烤箱也许会发生故障，或是接待处预订错了时间。
Additionally, in water, there are tiny floating particles that you might not notice until they show up in your images.
此外，海水中有大量微小浮游生物以及悬浮颗粒，你可能没有注意到他们的存在直到他们出现在你的照片中。
Additionally, in water, there are tiny floating particles that you might not notice until they show up in your images.
此外，海水中有大量微小浮游生物以及悬浮颗粒，你可能没有注意到他们的存在直到他们出现在你的照片中。
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