looks back
美英
        - na.回头看;回顾;追想 (to;upon);(对事业等)不起劲
第三人称单数:looks back 现在分词:looking back 过去式:looked back
 looks back
looks backlooks back
回头
My World Of InSpirATion: 包容 / tolerance ... 成均馆绯闻 / Sungkyunkwan Scandal 回头/ looks back 魅力/ charms ... 
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        This paper looks back general situation of the technologies of adsorption and separation and developing progresses of methane adsorbent.
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