In life, as in whist, hope nothing from the way cards may be dealt to you. Play the cards, whatever they be, to the best of your skill - Edward Bulwer-Lytton, Novelist
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精密無間隙雙導程蝸輪蝸杆,蝸輪蝸杆減速機,平面二次包絡減速機,蝸輪絲杆升降機