The key rings were fastened with hard plastic locks. The lock on the circular ring, Conrad saw, was cracked. On each key ring was a disk stamped with the number of keys that should be in the set. The disk on the circular ring was stamped “18.” Conrad counted the keys three times: there were only sixteen. He phoned Lieutenant Timothy Dial, the jail’s key-control officer, and said, “I’m going to need you to come down here.”
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有的家长把希望更多寄托给学校老师，但在学校或者没问题，但出了校园老师就没法管了。
alias, and then use it as a return type: