根据最近发表的一项关于人口的研究，如果老年人要对社会作出贡献而不是成为经济负担，就必须给他们更多学习机会。
Older people must be given more chances to learn if they are to contribute to society rather than be a financial burden, according to a new study on population published recently.
你所拥有的每一天，你都有机会作出令人难以置信的事情。
Every day that you have, you have the opportunity to make incredible things happen.
当通过在查询中设置更多谓词来提供更详细的搜索条件时，优化器就有机会作出更好的选择。
When you provide more detailed search conditions by having more predicates in a query, the optimizer has a chance to make better choices.
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