A strong army and a strong airforce are indispensible to the defence of a land locked country.
一个强有力的陆军和一个强有力的空军对于保卫一个四周皆陆的国家来说是必不可少的。
The evaluation criteria for rationality of practice should be defined respectively according to the three indispensible parts:rationality of end, rationality of instrument and rationality of value.
实践合理性的评价标准应当从实践合理性三个不可或缺的组成部分（目的合理性、工具合理性、价值合理性）分别加以考察。
In order to meet the technical requirements for the blade production, the main equipments which are made with advanced composite materials should be the indispensible premise.
为了满足风力机复合材料叶片生产的关键工艺要求，采用新型的复合材料叶片模具作为核心工艺装备成为必备条件。
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