So you can leave this text field empty (none) and later check that a valid certificate is selected at run time.

因此，您可以将此文本字段留空(none)并在以后运行时检查是否选择了有效的证书。

youdao

This is new in Aceh, none of us can remember a time when we could have a concert at night or fireworks and drive on the streets after dark.

这在亚齐是个新事物。 我们都不曾记得我们什么时候在晚上听过音乐会或看过焰火，在夜色中在街上开车。

youdao

But I understood none of this at the time and sat there in increasingly uncomfortable bewilderment, imagining all the while that I had breached some arcane nicety of local etiquette.

但当时我对所有这些一窍不通，只是茫然坐在那里感到越来越不舒服，觉得自己不知在什么地方拂了当地人的美意。

youdao

"While we would have much preferred none of this be made public at this time, we appreciate the paper's willingness to edit out those passages, which would likely have endangered personnel and operations in Afghanistan, " Morrell said in a statement.

CNN: Report: U.S. general calls for more troops in Afghanistan

None of this much concerned Mr Kohl at the time of the Maastricht treaty, however.

ECONOMIST: Europe's mid-life crisis

None of this was caught by anybody at the time.

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