目前为止，石墨烯带的制作都是通过自顶向下的方法，如用激光从大片石墨烯层上“剪”出带状或是“剖”开碳纳米管。
Until now, these graphene nanoribbons were made using top-down approaches, such as "cutting" the ribbons from larger graphene sheets or "unzipping" carbon nanotubes.
尼泊尔家庭事务部证实了他的说法，到目前为止，他们开没有要求这个国家的75个行政管理区给居民发写明性别的身份证。
His claim is underscored by the fact that Nepal 's Ministry of Home Affairs is yet to direct the country's 75 administrative districts to issue citizenship certificates that indicate gender identity.
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