测度生育安全的指标体系包括正向指标和负向指标。
Index system to evaluate fertility safety includes positive indexes and negative indexes.
在详细分析DES的基本原理和应用模式的基础上，结合DES硬件实现的特点，采用正向设计的方法实现了适用于IC卡等有嵌入式安全需要的系统中的DES模块。
On analysis of the principle and application mode of des, a des module which fits for embedded security system such as IC card is realized by topdown design methods.
一般来说，靠后的婴儿座椅和“双向席位需要更长的安全带比正向面对儿童座椅。
Generally, rearward-facing baby seats and 'two-way seats need longer seat belts than forward-facing child seats.
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