来自中国大约公元前1600年的记载显示，一端被咀嚼得直到变成像毛刷一样，另一端被削尖当做牙签使用。
Records from China around 1600 BC show that one end was chewed until it became brushlike, the other end was pointed and used as a toothpick.
Bretzel 被用来指称一种在烤前撒上粗盐粒、两端被打成小结的细面包卷。
Bretzel described as referring to a kind of thin bread roll twisted into a knot and salted before baking.
因此，这种机制要求客户端在切换到脱机模式前至少联机一次。
Therefore, this mechanism requires the client to be online at least one time before switching to offline mode.
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