To make the extension required, set the value of the lower property to 1; to make it non-required, set it to 0.

要使扩展成为必须的，设置下面的属性值为 1; 要设置它为非必须的，设置值为0。

youdao

Of course, you can make the extension required, in which case it is automatic (for the model where the profile is applied).

当然，您可使扩展成为必须的，这样它就可以自动扩展(概要文件被应用的模型)。

youdao

youdao

Coal reserves are due to be exhausted at the mine in around five years but an extension is required for the last three of those years.

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Therefore, an extension from the CFTC may be required.

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Handle the difficult Form 8949 reconciliations and explanations required on your tax return after the extension and before the final due date of Oct. 15.

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