Elements with an empty content model always use the empty tag abbreviation .

带有空内容模型的元素总是使用空标记缩写。

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With RRAFS, we can also create two Image VPs — one for the busy indicator and another with an empty content — as shown in Figures 19 and 20, respectively.

用RRAFS，还可以生成两个Image VP——一个用于占线指示器，另一个为空——如图19和图20分别所示。

youdao

Empty content of the message input box so that the user can start typing another message.

保持输入文本框为空，便于用户在此输入信息。

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It feels redundant, and tends to underscore the empty caloric content of what passes for information on Facebook.

FORBES: Facebook slices meaningless data a little finer, outraging millions