Most shoelaces on running shoes are extra long, so be safe and double-knot them.
多数跑鞋的鞋带很长，所以要系好，要系双扣。
Double transducer simplifies mechanic gearing. Easy to maintain, little wear and long life.
双变频简约机械结构，易维护、磨损少、寿命长。
Double transducer simplifies mechanic gearing. Easy to maintain, little wear and long life.
双变频简约机械结构，易维护、磨损少、寿命长。
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