1、
Man. was. is and always will be trying to improve his living conditions.
人类过去. 现在而且将来总是在尽力改善生活条件.
互联网
2、
Man , was, is and always will be trying to improved his living conditions.
人类过去, 现在而且将来总是在尽力改善生活条件.
互联网
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