you set only once, used once, of course, set back every time.
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you set only once
你只设置一次
以上为机器翻译结果，长、整句建议使用 人工翻译 。
This means that you have to set up a data source only once.
这意味着您必须只能设置一次数据源。
youdao
You need to set up the program only once.
您只需要创建程序一次。
You only need to set the initial focus once, because Swing will always restore focus once it has been initially set.
您只需设置初始焦点一次，因为Swing始终会将焦点恢复到初始的设置。
Not only will you have once again set a standard in remote design for a decade, you'll have made YouTube on TiVo something other than a painful way to torture party guests with bloopy sounds.
ENGADGET: Ten years of TiVo: how far we haven't come
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