在注册调用返回之后，该池就可以提供所请求的最低数量的对象。
After the registration call returns, the requested minimum number of objects is available in the pool.
如果已经分配了最低数量的对象，则对象的弱引用被放置到队列中。
If the minimum number of objects is already allocated, then a weak reference to the object is enqueued.
请注意，对特殊订单我们有最低数量要求。每种花样定购数量不低于500打。
Please note that for special orders we have a minimum quantity requirement. It should be no less than 500 dozen for each pattern.
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