“PPD”是“Presidential Policy Directive”的缩写，意思

09.01 -

“PPD”是“Personal Protective Division”的缩写，意思是

08.31 -

“PPD”是“Presidential Policy Directives”的缩写，意思

08.31 -

“PPD”是“Precision Pulmonary Diagnostics”的缩写，意

08.31 -

“PPD”是“Physical Plant Division”的缩写，意思是“物理

08.31 -

“WWQ”是“Wise Wisdom Quotes”的缩写，意思是“智慧语录”

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“WWQ”是“World Wide Quote”的缩写，意思是“全球引述”

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“SAFE”是“Alternatives for Everyone”的缩写，意思是“

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“SAFE”是“Security Application For Enterprise”的缩

08.30 -

“SAFE”是“Saving Antiquities for Everyone”的缩写，意

08.30 -