Weak vital registration systems, especially in the regions where most stillbirths occur, limit the availability of data and hamper the calculation of precise estimates.

生命登记系统存在的薄弱环节，尤其是在死产发生最高的地区，使数据的可用性受到限制，同时也阻碍了对精确估值的计算。

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Other techniques employed include buying securities in weak markets and selling into strength in order to further limit transaction costs.

其它应用到的技术包括：在市场疲软时买进证券而在市场强劲时卖出证券，这样可以进一步地限制交易成本。

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In the weak coupling limit the lowest-order correction to the geometric phase is derived analytically and the general case is calculated numerically.

文中推导并得到了在弱耦合极限下几何相位的最低阶修正的解析解及一般情况下的数值解。

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Dugas said that market conditions are expected to remain relatively stable for the rest of the year, but high resale inventory, particularly foreclosure inventory, expiration of the tax credit and weak consumer confidence could limit the pace of housing's recovery for several more quarters.

FORBES: Earnings Season

Employers are still cautious and weak demand will continue to limit new hiring.

ECONOMIST: America's labour market: Something's not working | The

You can limit the damage of a weak online presence by being proactive.

FORBES: 6 Sure Ways To Sabotage Your Job Search