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Tags : Features:, rn1.It, is, a, new, sailing, model ...
Tags : Features:,rn1.It,is,a,new,sailing,model,utilizing,the,same,power,system,with,the,solar,racing,car,but,different,in,gear,ratio.,rn2.The,crankshaft-,gear,mechanism,can,be,learnt,well,through,the,assembly.,rn3.By,adjusting,the,rudder,to,improve,its,straight,
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