自1996年，国会通过了《水银电池管理法案》，大多数可任意使用的碱性电池几乎不再含有水银成分了。

Since Congress passed the Mercury-Containing Battery Management Act in 1996, most disposable alkaline batteries contain little or no mercury.

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统计数据表明，一个典型的中国家庭通常把可任意使用的那部分收入中的35%到45%储蓄起来。

Hence, household savings will play an important role in feeling investment. Statistic shows that a typical Chinese household saves as much as 35 to 45 percent of its disposable income.

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模型的主实例保持长期状态，并提供应用程序逻辑；而视图使用的副本实际上是一个可任意使用的数据访问对象。

The primary instance of the model is keeping long-term state and providing application logic; the copy used by the view is essentially a disposable data-access object.

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