Proper care must be taken to ensure that object-relational database mappings are correct, and ideally the code should be designed to minimize the changes necessary when requirements change.

必须注意确保对象到关系数据库映射的正确性，理想情况下，应该将代码设计成在需求变更时所需的更改最小。

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The consequence of failure in any place may be predicted by calculation when pool fire occurs, so that necessary preventive measures can be taken.

通过计算可以预测池火灾发生时任意点处的失效后果，以便采取必要的防范措施。

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When preparing elementary school test , care should be taken not to make the vocabulary more difficult than necessary .

在拟定小学的考试题目时，应小心避免词汇过难。

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Because of the Great Recession when he took office, and because obviously of the measures necessary to be taken to avert a depression, here is what happened to deficits as a share of GDP in 2009.

WHITEHOUSE: Press Briefing