sharedbikes like xx xxbring great convenience people。You neednt lock them simplyusing your smart phone。 cantake you where busdont go。 leftanywhere nextuser。 However,bad things happen。 Some people damage QRcode ownlock, which causes trouble otherusers。 myopinion, its difficult peoplesideas shorttime。 Therefore, bike-sharing panies like xx xxneed dosomething。 example,those who damage bikeshould pay actions。