赠与人的继承人或者 法定 代理人的撤销权，自知道或者应当知道撤销原因之日起六个月内行使。
The heir or legal agent of the donor shall exercise the right of revocation within six months after he became, or should have become, aware of the cause for revocation.
他们可能已经在其他地方找到另一笔贷款，也有可能不再需要贷款，但在一般情况下，撤销原因都不明确。
They may have found another loan elsewhere, they may no longer need a loan, but in general, the reason for their withdrawal is unclear.
这也是Scope实现IDisposable的原因：Scope将用于using块中，以便构造函数发布实例以及Dispose方法撤销该实例。
And this is why Scope implements IDisposable: Scope will be used in a using block, such that the constructor publishes the instance and the Dispose method revokes it.
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