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持续时间：指定了锁被持有的时间长度。
Duration: Specifies the length of time for which a lock is held.
youdao
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随着时间的推移，它们持有的证券将可能减少。
Over time their holdings of securities will probably be wound down.
youdao
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随着时间的推移，它们持有的证券将可能减少。
Over time their holdings of securities will probably be wound down.
youdao