Today, I went back to the keycutter for the second time because apartment key I gave to my boyfriend didn't work.
今天我第二次去找配钥匙的那个人,因为我给我男朋友配的钥匙不能用。
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The rock resistance to abrasion is one of the key elements which influence the degree of the cutter attrition and it has close relationship with the rock physical mechanics.