1. Is everyone hearing census phone calls or seeing people knocking doors in last ten years or in lifetime. 是不是每個人都有接到人口普查的電話，或看到調查員敲門或按門鈴，在這十年內或一生中。 2. Can census people do complete survey for entire populations, likely shorthanded. 人口普查的人是不是有能力調查所有人口，人手不足。 3. People use cellphones, with their local phones removed. 人們用手機而非電話。 Can census people find out. 人口普查人員能否有手機電話。
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