With some implementations of the singleton, you allow writers of subclasses to override methods polymorphically, something not possible with static methods.
最后，在单例模式的一些实现方式中，单例类的子类能够动态地重载方法，这是静态方法所不能办到的。
You can access methods on singleton objects similar to how you would call static methods.
您可以像调用静态方法一样访问单例对象的方法。
You will design the object as a singleton (this design pattern will limit this object to a single instance) and have the appropriate retrieve and store methods to manipulate the cache.
您将把对象设计为一个单子实例 （singleton）（这个设计模式将把这个对象限制在一个单个实例中）并使用合适的检索和存储方法对高速缓存进行操作。
Methods the full term pregnant women with singleton and cephalic presentation were examined during a week before childbirth.
方法对来我院行产前(一周内)检查及分娩的足月单胎头位孕妇作为观测对象。
Methods Body wight index (BWI) was calculated before pregnancy and maternal weight gain and pregnancy outcomes were followed up in 2 584 primipara with singleton births.
方法对2 584例单胎初产妇，测量孕前身高、体重和孕期体重增加情况，计算体重指数（BWI），并随访妊娠结局。
Methods Body wight index (BWI) was calculated before pregnancy and maternal weight gain and pregnancy outcomes were followed up in 2 584 primipara with singleton births.
方法对2 584例单胎初产妇，测量孕前身高、体重和孕期体重增加情况，计算体重指数（BWI），并随访妊娠结局。
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