照现在的情形，这条法律是难以执行的。
资源匮乏地区产前筛查难以执行的原因。
Antenatal screening can be difficult to implement in resource poor Settings for a number of reasons.
总是想要识别有用设计元素，避免制定人工难以执行的决策。
Always try to recognize useful design elements, and try to avoid decisions that make it artificially hard to do so.
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