持主题公园参观券的观众只能从5号门进入，并且只能在主题公园内参观游览，不能进入陆域观看区。
The spectator with ticket to The Theme Park may only enter through Gate No5, and tour within the park, not permitted in Spectator Area.
杜氏变换是一种将信号从时域到门宽域的变换，用信号的宽谱密度来描述信号的特征。
The Du-conversion is one that converse the signal from time domain to gate-width domain and uses the wide spectrum density of the signal to show its characteristics.
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